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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 st

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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 st

 

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?       
                
                

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