A random sample of 200 freshman and 100 seniors at ferris high school

1. A vague pattern of 200 freshman and 100 seniors at Ferris High Ground are asked whether they suit delay a delineation to acquit remarkable arrange students (juniors and seniors) a half hour future suitableness guardianship underarrange students (freshmen and sophomores) in ground for the last half hour. Of the students patternd, 160 freshmen incongruous the delineation and 20 seniors incongruous the delineation.
-Is there a estrangement (5% cunninge of mediuming) betwixt the adaptation of freshmen who withstand the delineation and the adaptation of seniors who withstand it? Do a consummate experience showing all the talents.

2) In a consider of courage surgery, one manifestation was the issue of drugs designated beta-blockers on the pulse objurgate of unrepinings during surgery. The conducive subjects were divided at vague into two clumps of 30 subjects each. One clump ordinary the beta-blocker and the other ordinary a placebo. The pulse objurgate of each unrepining at a exact purpose during the influence was commemorative. The texture clump had a medium of 65.2 and flag flexion of 7.8. For the administer clump, the medium was 70.3 and flag flexion was 8.3. 
You scantiness to see if the beta-blockers weaken the pulse objurgate. 

a. Experience the grounds at the 5% cunninge of mediuming. Give amiable statistical indication. (ie., use the embezzle 4-part format). 

b. Give a 99% reliance space-between for the estrangement in medium pulse objurgates. 

c. Interpret the reliance space-between you constructed

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