Instructions Suppose the number of equipment sales and service contracts that a store sold during the last six (6) months for treadmills and exercise bikes was as follows: Treadmill Exercise BikeTotal sold 185 123Service contracts 67 55 The store can only sell a service contract on a new piece of equipment. Of the 185 treadmills sold, 67 included a service contract and 118 did not. Complete the following questions in the space provided below: Construct a 95 percent confidence interval for the difference between the proportions of service contracts sold on treadmills versus exercise bikes. Is there a major difference between the two pieces of equipment? Why or why not? Complete the following: Not allowed. This test can only be taken once. This test can be saved and resumed later.

### QUESTION 1

1. Construct a two proportion confidence interval. Calculate the upper confidence level.

10 points

### QUESTION 2

1. Suppose the number of equipment sales and service contracts that a store sold during the last six (6) months for treadmills and exercise bikes was as follows: Treadmill Exercise BikeTotal sold 185 123Service contracts 67 55The store can only sell a service contract on a new piece of equipment. Of the 185 treadmills sold, 67 included a service contract and 118 did not.Complete the following questions in the space provided below:

1. Construct a 95 percent confidence interval for the difference between the proportions of service contracts sold on treadmills versus exercise bikes.

Compute the lower confidence level.

10 points

### QUESTION 3

1. There a major difference between the two pieces of equipment?

10 points

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