# Simon fraser university buec 232 final exam 2015 (all correct)

Question

1. Ginger rise is used by frequent as a dietary addition. A creator of additions produces capsules that are advertised to comprehend at mediumest 500 mg. of basis ginger rise. A consumer panegyric assemblage doubts this pretension and establishments the hypotheses H0: ? = 500 Ha: ? < 500 fixed on measuring the undivided of ginger rise in a SRS of 100 capsules. Suppose the results of the establishment miscarry to throw-by H0 when, in truth, the precious fancy is penny. In this instance the consumer panegyric assemblage gain accept

a. committed a Type I fault.

b. committed a Type II fault.

c. no chattelsiveness to unmask a medium of 500.

2. A researcher reports that a establishment is "forcible at 5%." This establishment gain be

a. Forcible at 1%.

b. Not forcible at 1%.

c. Forcible at 10%.

3. Suppose the medium Math SAT mandible for all wards prelude the exam this year is 480 delay plummet disconnection 100. Usurp the dispensation of mandibles is regular. The senator of a feature detailize notices that the medium mandible for wards in his detailize who took the Math SAT is 500. His detailize recently adopted a new mathematics curriculum and he wonders if the improved mandibles are exemplification that the new curriculum has been lucky. Gone aggravate 10,000 wards in his detailize took the Math SAT, he can demonstration that the P-value for establishmenting whether the medium mandible in his detailize is balance than the general medium of 480 is short than 0.0001. We may justly deduce that

a. there is zealous statistical exemplification that the new curriculum has improved Math SAT mandibles in his detailize.

b. although the results are statistically forcible, they are not really forcible, gone an development of 20 aims is fairly diminutive.

c. these results are not cheerful exemplification that the new curriculum has improved Math SAT mandibles.

4. I shortness to form a 92% self-reliance cessation. The punish z* to use is

a. 1.75

b. 1.41

c. 1.645

5. The tutor of a arrangementatize of 40 excellent discipline seniors is inquiring whether the medium Math SAT mandible µ for the population of all 40 wards in his arrangementatize is elder than 500 or not. To canvass this, he decides to establishment the hypotheses

H0: µ = 500

Ha: µ & gt; 500

at roll 0.05. To do so, he scolds that medium Math SAT mandible of all the wards in his arrangementatize and forms a 95% self-reliance cessation for the population medium. The medium Math SAT mandible of all the wards was 502 and, turgid the plummet disconnection of the mandibles is α = 100, he invents the 95% self-reliance cessation is 502 ± 31. He may deduce

a. H0 cannot be throw-byed at roll α = 0.05 accordingly 500 is delayin self-reliance cessation.

b. H0 cannot be throw-byed at roll α = 0.05, but this must be established by carrying out the fancy establishment rather than using the self-reliance cessation.

c. We can be assured that H0 is not penny.

6. I aim to invent a 95% self-reliance cessation for the medium calculate of durations men modify channels delay a alien curb during a interchangeable. Fixed on a precursive consider, I like s = 15. How frequent interchangeables' excellence of axioms do I need to accept a lip of fault no balance than 3?

a. 10

b. 97

c. 96

7. Experiments on scholarship in animals casually appraise how crave a laboratory rat engages to invent its way through a complexity. Suppose for one feature complexity, the medium duration is social to be 20 relieves delay a plummet disconnection of = 2 relieves. Suppose besides that durations for laboratory rats are regularly reserved. A researcher decides to establishment whether rats defenseshort to cigarette steam engage craveer on medium to finished the complexity. She exposes 25 rats to cigarette steam for 15 minutes and then chronicles how crave each engages to finished the complexity. The medium duration for these rats is 20.6 relieves. Are these results forcible at the = 0.05 roll? Usurp the researcher's rats can be considered a SRS from the population of all laboratory rats.

a. Yes.

b. No.

c. The scrutiny cannot be answered gone the results are not really forcible.

8. The durations for desert rats to run a plummet complexity has a N (65, 15) dispensation where the durations are appraised in relieves. The researchers vision to demonstration that luxuriance improves the durations. The precious fancy is

a. Ha: µ > 65.

b. Ha: > 65.

c. Ha: µ < 65.

9. Does prelude garlic tablets twice a day cater forcible soundness benefits? To canvass this upshot, a researcher conducted a consider of 50 adult themes who took garlic tablets twice a day for a bound of six months. At the end of the consider, 100 inconstants akin to the soundness of the themes were appraised on each theme and the mediums com-pared to social mediums for these inconstants in the population of all adults. Foul-mouthed of these inconstants were forciblely melioreprimand (in the view of statistical discernment) at the 5% roll for the assemblage prelude the garlic tablets as assimilated to the population as a undivided, and one inconstant was forciblely melioreprimand at the 1% roll for the assemblage prelude the garlic tablets as assimilated to the population as a undivided. It would be punish to deduce

a. there is cheerful statistical exemplification that prelude garlic tablets twice a day caters some soundness benefits.

b. there is cheerful statistical exemplification that prelude garlic tablets twice a day caters benefits for the inconstant that was forcible at the 1% roll. We should be subordinately cowardly encircling making pretensions for the inconstants that were forcible at the 5% roll.

c. None of the aloft.

10. To assess the ratification of a kitchen lamina a plummet gravity social to discuss 1 gram is discussed a entirety of n durations and the medium, , of the discussings is scoldd. Suppose the lamina readings are regularly reserved delay unsocial medium, µ , and plummet disconnection = 0.01 g. How abundant should n be so that a 90% self-reliance cessation for µ has a lip of fault of ± 0.0001?

a. 165

b. 27061

c. 38416

11.Suppose that you are a ward is-sueer in the statistics function and consort to be remunerated by the Casual Pay arrangement. Each week the Chair flips a sumerfeit. If the sumerfeit comes up heads, your pay for the week is \$80; if it comes up tails, your pay for the week is \$40. You is-sue for the function for 100 weeks (at which aim you accept skilled abundance likelihood to apprehend the arrangement is not to your service). The likelihood that , your medium suitables in the primeval two weeks, is elder than \$65 is

a. 0.2500.

b. 0.3333.

c. 0.5000.

12. A set of ten cards consists of five red cards and five black cards. The cards are shuffled fully and I am loving the primeval foul-mouthed cards. I sum the calculate of red cards X in these foul-mouthed cards. The casual inconstant X has which of the subjoined likelihood dispensations?

a. The binomial dispensation delay parameters n = 10 and p = 0.5.

b. The binomial dispensation delay parameters n = 4 and p = 0.5.

c. None of the aloft.

13. In a pre-election poll, 400 of the 500 serious voters polled permissioned the urgent. In this poll, the pattern adjustment, , of those harmonious the challenger is

a. 0.80

b. 0.20

c. 0.50

14. Incomes in a assured town are zealously suitable skewed delay medium \$36000 and plummet disconnection \$7000. A casual pattern of 10 households is engagen. What is the likelihood the medium of the pattern is balance than \$38000?

a. 0.3875

b. 0.1831.

c. Cannot say.

15. The mandibles of special wards on the American Garden Testing (ACT) Program composite garden inlet establishment accept a regular dispensation delay medium that varies slightly from year to year and plummet disconnection 6.0. You guile to engage an SRS of bigness n of the wards who took the ACT exam this year and scold the medium mandible of the wards in your pattern. You gain use this to like the medium mandible of all wards this year. In tabulateify for the plummet disconnection of to be no balance than 0.1, how abundant should n be?

a. At mediumest 60.

b. At mediumest 3600.

c. This cannot be established accordingly we do not apprehend the penny medium of the population.

16. We shortness to engage a pattern of 100 items out of a abundant concoct for capacity curb purposes. Fixed on elapsed narrative, the adjustment of insufficient items is 4%. Can we use the regular advance to the binomial dispensation to invent the likelihood of inventing balance than 5 insufficient items in the pattern of 100?

a. Yes, accordingly n is abundant.

b. No

c. We do not accept abundance instruction.

17. The SAT mandibles of entering freshmen at University X accept a N (1200, 90) dispensation and the SAT mandibles of entering freshmen at University Y accept a N (1215,110) dispensation. A casual pattern of 100 freshmen is patternd from each University, delay the pattern medium of the 100 mandibles from University X and the pattern medium of the 100 mandibles from University Y. The likelihood that is elder than µ Y, the population medium for University Y, is

a. 0.0475.

b. 0.0869.

c. 0.4325.

Quizzes expeditions by Dr. Patricia Humphrey, Georgia Southern University

18.Suppose that you are a ward is-sueer in the Statistics Function and they consort to pay you using the Casual Pay arrangement. Each week the Chair flips a sumerfeit. If it comes up heads, your pay for the week is \$80, and if it comes up tails, your pay for the week is \$40. You is-sue for the function for two weeks. Let be the medium of the pay you accept for the primeval and relieve week. The sampling dispensation of is : \$40 \$60 \$80

a. loving by the subjoined likelihood dispensation.

Probability: 0.25 0.50 0.25

b. approximately regular delay medium \$60 and plummet disconnection 14.14.

c. considerately regular delay medium \$60 and plummet disconnection 14.14.

19. From antecedent polls, it is believed that 66% of mitigated voters promote the urgent. A new poll of 500 mitigated voters gain be conducted. In the new poll, if the adjustment harmonious the urgent has not modifyd, what is the medium and plummet disconnection of the calculate promotering the urgent?

a. µ = 330, s = 10.59

b. µ = 0.66, s = 0.021

c. µ = 330, s = 18.17

20. From antecedent polls, it is believed that 66% of mitigated voters promote the urgent. A new poll of 500 mitigated voters gain be conducted. In the new poll, if the adjustment harmonious the urgent has not modifyd, what is the likelihood that balance than 68% gain permission the urgent?

a. 32%.

b. 82.7%

c. 17.1%

21.A national subject is zealous in comparing the acquiesces of two varieties of tomatoes. In an tentative scene, she selects 40 locations and assigns 20 guilets from each contrariety at casual to the locations. She states the medium per guilet (in pounds). She scolds a 95% self-reliance cessation for the contrariety in medium acquiesces among the two varieties using the two-pattern t procedures delay the resulting cessation (2.13, 6.41). For establishmenting using the two-pattern t procedures we can say that

a. the P-value could be elder than 0.05.

b. the P-value must be short than 0.05.

c. no instruction encircling the P-value can be obtained delayout the establishment statistic.

22.As the degrees of insubservience beseem abundantr, the contrariety among the t and z dispensations beseems

a. Narrower

b. Stays the same

c. Wider

23.Some researchers accept conjectured that stem-pitting complaint in peach-tree seedlings chattelsiveness be curbled through exterminate and befoul composition. An experiment was conducted to assimilate peach-tree seedling development delay befoul and exterminates treated delay one of two herbicides. In a scene comprehending 10 seedlings, five were casually clarified throughout the scene and assigned to accept Herbicide A. The surplus acceptd Herbicide B. Befoul and exterminates for each seedling were treated delay the expend herbicide, and at the end of the consider bound the culmination in (cm) was chronicled for each seedling. The subjoined results were obtained:

Herbicide A 87 80 80 76 73

Herbicide B 78 77 74 68 62

A 90% self-reliance cessation for the contrariety in medium culminations for the two herbicides is (0.2, 14.6). Which detailizement is punish?

a. The P -value for a establishment of the inoperative fancy of similar mediums and the precious of divergent mediums would be elder than 10% gone the cessation doesn't apprehend 0.

b. A 95% self-reliance could not apprehend cipher either, gone we  would be flush balanceconfident of a contrariety in the assemblages.

c. Twain (a) and (b) are incorrect.

24. I did an eggsperiment delay a tally preceptor one day. His calculus arrangementatize was because books of solids by rotating curves encircling the x-axis. We measureed the book of an egg as an ellipsoid, and appraised eggs delay calipers, using the calculus formula. Each egg was besides appraised for book using a infiltreprimand misplacement arrangement. We shortnessed to apprehend if the two arrangements consortd or not. The axioms were

A 95% self-reliance cessation for the medium contrariety (calculus - infiltrate) is

a. (-1.69, 5.04)

b. (-7.54, 10.90)

c. (-2.29, 5.64)

25.Suppose that a casual pattern of 41 detailize garden wards is asked to appraise the protraction of their suitable base in centimeters. A 95% self-reliance cessation for the medium base protraction for wards at this university turns out to be (21.709,25.091). Which of the subjoined is penny?

a. The pattern medium was 23.4 cm.

b. The lip of fault is 3.382

c. If the self-reliance roll is modifyd to 90% we gain get a travel cessation.

Quizzes expeditions by Dr. Patricia Humphrey, Georgia Southern University

26.A national subject is zealous in comparing the acquiesces of two varieties of tomatoes. In an tentative scene, he selects 20 locations and assigns 10 guilets from each contrariety at casual to the locations. He states the acquiesce per guilet (in pounds). The medium acquiesce for guilets of contrariety 1 was = 16.3 pounds delay a plummet disconnection = 3 pounds. The medium acquiesce for guilets of contrariety 2 was =18.4 pounds delay a plummet disconnection = 4 pounds. The plummet fault of the contrariety in pattern mediums is

a. 2.10 pounds.

b. 2.50 pounds.

c. 1.58 pounds.

27. The supervisor of an automobile dealership is because a new benefit guile to development sales. Currently, the medium sales reprimand per salesperson is five automobiles per month. The punish set of hypotheses to establishment the chattels of the benefit guile is

a. H0: µ < 5      Ha: µ ≤ 5

b. H0: µ ≤ 5     Ha: µ > 5

c. H0: µ > 5      Ha: µ ≤ 5

28.A bank is investigating ways to seduce customers to enjoin balance on their security cards. (Banks deserve a fee from the importer on each donation, and vision to congregate profit from the customers as courteous). A bank selects a casual assemblage of customers who are told their "cash back" gain development from 1% to 2% for all enjoins aloft a assured dollar undivided each month. Of the 500 customers who were told the development applied to enjoins aloft \$1000 each month, the medium development in spending was \$527 delay plummet disconnection \$225. Of the 500 customers who were told the development applied to enjoins aloft \$2000 each month, the medium development in spending was \$439 delay plummet disconnection \$189. When establishmenting whether or not the developments in spending are divergent, the establishment is forcible at

a. 5%

b. 1%

c. 0.5%

29.A researcher aimed to assimilate the medium undivided of duration late in extracurricular activities by excellent discipline wards in a cosmopolitan discipline environs delay that in a discipline environs of a abundant city. The researcher obtained an SRS of 60 excellent discipline wards in a abundant cosmopolitan discipline environs and endow the medium duration late in extracurricular activities per week to be = 6 hours delay a plummet disconnection s1 = 3 hours. The researcher besides obtained an recalcitrant SRS of 40 excellent discipline wards in a abundant city discipline environs and endow the medium duration late in extracurricular activities per week to be = 4 hours delay a plummet disconnection s2 = 2 hours. Let µ 1 and µ 2 indicate the medium undivided of duration late in extracurricular activities per week by the populations of all excellent discipline wards in the cosmopolitan and city discipline environss, respectively. If the researcher used the balance accureprimand software advance to the degrees of insubservience, he would accept used which of the subjoined for the calculate of degrees of insubservience for the two-pattern t procedures?

a. 39.

b. 59.

c. 98.

30. We aim to see if the dial clime for a assured measure oven is justly calibrated. Foul-mouthed ovens of a assured measure are clarified at casual. The dial on each is set to 300° F and forthcoming one hour, the real clime of each is appraised. The climes appraised are 305°, 310°, 300°, and 305°. Turgid that the real climes for this measure when the dial is set to 300° are regularly reserved delay medium µ , we establishment whether the oven is justly calibrated by establishmenting the hypotheses

H 0: µ = 300, H a: µ ≠ 300.

Based on the axioms, the P -value for this establishment is

a. among 0.10 and 0.05.

b. among 0.05 and 0.025.

c. among 0.025 and 0.01.

31.An visitor inspects abundant trafficloads of potatoes to state the adjustment delay elder defects anterior to using the potatoes to be made into potato chips. She intends to scold a 95% self-reliance cessation for p. To do so, she selects an SRS of 50 potatoes from the aggravate 2000 potatoes on the traffic. Suppose that simply 2 of the potatoes patternd are endow to accept elder defects. Which of the subjoined selfreliances for consequence encircling a adjustment using a self-reliance cessation are violated?

a. The population is at mediumest 10 durations as abundant as the pattern.

b. n is so abundant that twain the sum of successes n and the sum of miscarryures n (1 - ) are 10 or balance.

c. There answer to be no violations.

32. A creator accepts compatability from two suppliers. An SRS of 400 compatability from supplier 1 invents 20 insufficient. An SRS of 100 compatability from supplier 2 invents 10 insufficient. Let p1 and p2 be the adjustment of all compatability from suppliers 1 and 2, respectively, that are insufficient. A 98% self-reliance cessation for p1 - p2, the contrariety in the two adjustments is

a. -.05 ? 0.033.

b. -.05 ? 0.068.

c. - .05 ? 0.074.

33. I shortness to like the adjustment of specials in my area who imagine the social discipline arrangement needs elder aggravatehauling. If I believe the adjustment gain be encircling 35%, how frequent specials gain I need to pattern if I shortness a 95% lip of fault to be no balance than 3%?

a. At mediumest 30.

b. At mediumest 1068.

c. At mediumest 972.

34.A poll invents that 54% of the 600 fellow-creatures polled permission the urgent. Shortly forthcoming the poll is engagen, it is perceiven that he had an extramarital subject. A new poll invents that 50% of the 1030 polled now permission the urgent. The plummet fault for a self-reliance cessation for the candidate's laestablishment assistance roll is

a. 0.016

b. 0.020

c. 0.025

35. A ward believes that 20% of all wards imagine pepperoni is their permissionite pizza. He performs a establishment of fancy, H0: p = 0.2, having engagen a pattern of 200 wards and inventing that 52 imagine pepperoni is their permissionite. He invents a p-value of 0.0338, so throw-bys the inoperative at ? = 0.05. He then scolds a 95% self-reliance cessation for the penny adjustment and invents it is (0.199, 0.321). He is promiscuous. 20% is in the cessation! What is the contrariety?

a. He made a misengage in one of his calculations.

b. The two use divergent values of p in computing the plummet disconnection.

c. He should accept used the plus foul-mouthed self-reliance cessation.

36. A poll invents that 54% of the 600 fellow-creatures polled permission the urgent. Shortly forthcoming the poll is engagen, it is perceiven that he had an extramarital subject. A new poll invents that 50% of the 1030 polled now permission the urgent. We shortness to apprehend if his assistance has decreased. The establishment statistic is

a. z = 1.56

b. z = -2.57

c. z = -1.55

37. I shortness to apprehend which of two manufacturing arrangements gain be meliorate. I invent 10 prototypes using the primeval arrangement, and 10 using the relieve. There were 3 insufficients in the primeval concoct and 5 in the relieve. Invent a 95% self-reliance cessation for the contrariety in the adjustment of insufficients.

a. (-0.62, 0.22)

b. (-0.56, 0.22)

c. (-0.493, 0.160)

38. A pattern of 75 wards endow that 55 of them had cell phones. The lip of fault for a 95% self-reliance cessation like for the adjustment of all wards delay cell phones is

a. 0.084

b. (0.633, 0.833)

c. 0.100

39.A poll invents that 54% of the 600 fellow-creatures polled permission the urgent. Shortly forthcoming the poll is engagen, it is perceiven that he had an extramarital subject. A new poll invents that 50% of the 1030 polled now permission the urgent. We shortness to apprehend if his assistance has decreased. In computing a establishment of fancy delay , what is the like of the aggravateall adjustment, ?

a. 52%

b. 52.5%

c. 51.5%

40. 100 rats whose mothers were defenseshort to excellent rolls of tobacco steam during pregnancy were put through a plain complexity. The complexity required the rats to frame a precious among going left or going suitable at the opening. 80 of the rats went suitable when ordinary the complexity for the primeval duration. Usurp that the 100 rats can be considered an SRS from the population of all rats born to mothers defenseshort to excellent rolls of tobacco steam during pregnancy (still n ess that this selfreliance may or may not be serious, but researchers frequently usurp lab rats are indicateative of abundant populations gone they are frequently bred to accept unvarying characteristics). Let p be the adjustment of rats in this population that would go suitable when ordinary the complexity for the primeval duration. A 90% self-reliance cessation for p is

a. 0.8 ± .040.

b. 0.8 ± .066.

c. 0.8 ± .078.

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