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1. Homework Assignment 8
   Due in Week 9 and worth 30 points

   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 Bike
   Total sold 185 123
   Service 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:

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