Suppose a sporting goods store sold treadmills, exercise bikes, and equipment service contracts over the past six months as shown in the table below.
|Equipment and Service Contract Sales|
|Service Contract Sales||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.
Respond to the following in a Word document and submit:
1. Construct a 95 percent confidence interval for the difference between the proportions of service contracts sold on treadmills versus exercise bikes.
2. Determine if there is or is not a major difference between the two pieces of equipment and provide a rationale for your response.