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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