Suppose the number of equipmentsales and service contracts that a store sold during the last six (6) monthsfor treadmills and exercise bikes was as follows:
Treadmill Exercise Bike
Total sold 185 123
Service contracts 67 55
The store can only sell a servicecontract on a new piece of equipment. Of the 185 treadmills sold, 67 included aservice contract and 118 did not.
Complete the following questionsin the space provided below:
1. Constructa 95 percent confidence interval for the difference between the proportions ofservice contracts sold on treadmills versus exercise bikes.
2. Is therea major difference between the two pieces of equipment? Why or why not?
