Question

Asked Nov 20, 2019

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3. Can a test for the difference in proportions from Chapter 10 and a chi-square test of independence/association be utilized to analyze data from a 2x2 contingency table? Provide an example.

see the attached photo for an example of ch10 problem.

Step 1

Given:

In a lake city there are two shops, Zeke’s and Elmer’s that handle the majority of the town’s auto body repairs.

Number of cars: 7

Zeke’s estimation: 1058 544 1349 1296 676 998 1698

Elmer’s estimation: 995 540 1175 1350 605 970 1520

Step 2

a)

Construct a 99% C.I for the mean of the population differences

They give that the population difference is equal to (Zeke’s estimate – Elmer’s estimate)

Hence, difference is 63 4 174 -54 71 28 178

Mean of the difference is 43.4286.

Standard deviation is 72.3460.

Step 3

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