Suppose the number of equipment sales and service contracts that a

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 exercise bikes.                                   2.  Is there a major difference between the two pieces of equipment? Why or why not?                                                                              

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