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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