Business Statistics
11/23/2018 Take Test: Week 9 Homework Assignment – MAT510076VA016-...
https://blackboard.strayer.edu/webapps/assessment/take/launch.jsp?course_assessment_id=_1039203_1&course_id=_235379_1&content_id=_2638… 1/2
Test Information Description Description 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 195 138 Service contracts 60 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. Remember to watch the instructional video and use the excel template provided to help you with the math. Complete the following questions in the space provided below:
1. Is there a major difference between the two pieces of equipment? Why or why not? 2. Interpret the meaning of the confidence interval for Treadmills at a 95% confidence level. 3. Interpret the meaning of the confidence interval for Exercise Bikes at a 95% confidence level. 4. Are confidence intervals one-tailed or two-tailed? 5. Construct a 95 percent confidence interval for the difference between the proportions of service contracts sold on treadmills versus
exercise bikes.
Instructions Multiple Attempts
This test allows 5 attempts. This is attempt number 1.
Force Completion
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Question Completion Status:
Are confidence intervals one-tailed or two-tailed?
TWO-TAILED
ONE-TAILED
QUESTION 1 2 points Save AnswerSave Answer
Interpret the meaning of the confidence interval for Treadmills at a 95% confidence level.
95% of people purchased between 24 and 37 contracts after buying treadmills.
We are 95% confident that the number of contracts purchased is between 24.3 and 37.2
We are 95% confident that customers who purchased contract after purchasing treadmills is approximately between 24% and 37%.
Unable to determine this value given the information provided.
QUESTION 2 4 points Save AnswerSave Answer
Interpret the meaning of the confidence interval for Exercise Bikes at a 95% confidence level.
We are 95% confident that the percentage of customers that purchased Exercise Bikes is between 25% and 40%.
We are 95% confident that the percentage of customers that purchased Exercise Bikes is between 25 and 40 contracts.
We are 95% confident that the percentage of customers that purchased Exercise Bikes is more than 50%
Unable to determine this information.
QUESTION 3 4 points Save AnswerSave Answer
Using the two-proportion confidence interval formula we determine if there is a difference between the two proportions. Is there a difference between the proportions?
Yes
There is no difference because the confidence interval contains zero since the interval is between (-12% and 8%)
QUESTION 4 10 points Save AnswerSave Answer
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Deborah Hughes 40WEEK 9 WEEK 9 HOMEWORK ASSIGNMENT 8H
11/23/2018 Take Test: Week 9 Homework Assignment – MAT510076VA016-...
https://blackboard.strayer.edu/webapps/assessment/take/launch.jsp?course_assessment_id=_1039203_1&course_id=_235379_1&content_id=_2638… 2/2
Unable to determine this information given insufficient evidence.
Yes. The because we are 95% confident that the percentage of customers who -purchase contracts is under 12% and 8%
Construct a 95 percent confidence interval for the difference between the proportions of service contracts sold on treadmills versus exercise bikes. You may want to use this site to check your calculations: http://vassarstats.net/prop2_ind.html
(-12, 8)
(8,12)
(-12%, 8%)
Unable to determine
QUESTION 5 10 points Save AnswerSave Answer
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Deborah Hughes 40WEEK 9 WEEK 9 HOMEWORK ASSIGNMENT 8