Question description
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?
