week 9 Homework Assignment 8

# week 9 Homework Assignment 8

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Homework Assignment 8 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. Treadmills = 67 185 Proportion of treadmills ( P 1 ¿ = .36 Exercise bikes = 55 123 Proportion of exercise bikes ( P 2 ¿ = .45 Pt: 185 + 123 = 308 Pe: 67 + 55 = 122 P = ∑ servicecontracts treadmills exercisebikes P = 122 308 = .40 Therefore P = . 40

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Z- Score = p 1 p 2 p ( 1 p )( 1 n 1 + 1 n 2 ) Z- Score =
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• Fall '15
• Pei-hwaLo
• Statistics, Percentage point, service contracts, exercise bikes

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