Construct a 95 percent confidence interval for the difference between the proportions of service contracts sold on treadmills versus exercise bikes.

suppose the number of equipment sales and  service contracts that a store sold during the last six months for  treadmills and exercise bikes was as follows:

 

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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    cf_MAT510_homework_assignment_6.docx6.docx

    Suppose the number of equipment sales and service contracts that a store sold during the last six months for treadmills and exercise bikes was as follows:

    Equipment Sales and Service Contracts Sold
    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?

    Unformatted Attachment Preview

    MAT 510 – Homework Assignment Homework Assignment 6 Due in Week 9 and worth 30 points 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: Equipment Sales and Service Contracts Sold 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? Type your answers below and submit this file in Week 9 of the online course shell: Week 9 Quiz – Practice This time we use calculators instead of Excel 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: Total sold Service contracts Treadmill 195 60 Exercise Bike 138 45 The store can only sell a service contract on a new piece of equipment. Of the 195 treadmills sold, 60 purchased a service contract. Of the 138 exercise bikes, 45 purchased a service contract. Complete the following questions in the space provided below: 1. Interpret the meaning of the confidence interval for Treadmills at a 95% confidence level. Calculator for CI one proportion 2. Interpret the meaning of the confidence interval for Exercise Bikes at a 95% confidence level. Calculator for CI one proportion 3. Are confidence intervals one-tailed or two-tailed? 4. Construct a 95 percent confidence interval for the difference between the proportions of service contracts sold on treadmills versus exercise bikes. Calculator for CI Difference of two proportion 5. Is there a major difference between the two pieces of equipment? Why or why not? Using Formulas Confidence Interval for the Difference of Two Proportions .

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