Homework Week 9 .docx Homework Week 9 Strayer University Suppose a sporting goods store sold treadmills, exercise bikes, and equipment service contracts over the past six months as shown in the table below. 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. 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. Solution: 1. The confidence interval for difference between two proportions is given as follows: ∴The 95% confidence interval for the di
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