Business-Statistics-equipment-sales-and-service-contracts-Assignment-Homework-Help

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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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