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
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:
- Construct a 95 percent confidence interval for the difference between the proportions of service contracts sold on treadmills versus exercise bikes.
- Is there a major difference between the two pieces of equipment? Why or why not?
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