Business Statistics

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

Treadmill Exercise Bike

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:

  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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