Dat/565: data analysis and business analytics wk 3 – practice: wk 3 | DAT/565: Data Analysis And Business Analytics | University of Phoenix–Arizona

The Environmental Protection Agency (EPA) requires that cities warner balance 80 contaminants in their drinking water. Samples from the Lake Huron Water Treatment Plant gave the results shown less. All observations were subordinateneath the allowable consummation, as shown by the reported rank of contaminant planes. (presumably the moderation would be the midrange).

  Substance Range Detected Allowable
Maximum Origin of Substance   Chromium 0.41 to 0.60 100 Dismiss from steel and pulp mills, true erosion   Barium 0.006 to 0.020 2 Dismiss from training wastes, metal refineries, true erosion   Fluoride 1.09 to 1.15 4 True erosion, water embracing, dismiss from fertilizer and aluminum factories        

For each import, prize the standard deviation σ by coxcombical invariable dispensation and recognized dispensation shown in Table 8.11 in Section 8.8. (Round your answers to 4 decimal places.)

    Uniform Dispensation Recognized Dispensation   Chromium               Barium               Fluoride    

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Item 8                            Item 8                                                                2          points                                      Item          Skipped     High planes of cockpit investigate in an aircraft can mischief the hearing of leads who are defenseless to this venture for multifarious hours. Cockpit investigate in a jet aircraft is mainly due to airflow at hundreds of miles per hour. This 3 × 3 affluence board shows 61 observations of basis firm by an airline lead using a handheld investigate meter in a fixed aircraft cockpit. Investigate plane is defined as “low” (subordinate 88 decibels), “medium” (88 to 91 decibels), or “high” (92 decibels or past). Tless are three soaring presentations (climb, cruise, declination).
Cockpit Investigate Soaring Presentation Noise LevelClimb (B)Cruise (C)Descent (D)Row TotalLow (L) 5  8  5  18 Medium (M) 16  7  2  25 High (H) 6  5  7  18 Column Total 27  20  14  61  
 Click less for the Excel Basis File

(a) Calculate the forthcoming probabilities: (Round your answers to 4 decimal places.)
    i.P(B)  ii.P(L)  iii.P(H | C)  iv.P(H | D)  v.P(L and B)  vi.P(L and C)   (b) Do you see proof that investigate plane depends on soaring presentation?



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