# equipment sales and service contracts, statistics homework help

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### Question 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:

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?

FinAccGuru
School: Carnegie Mellon University

Here is the answer. Thanks a lot.

X1 and X2
n1 and n2
P1
P2
(1-P1)
(1-P2)

Standard Z Value
P1*(1-P1)
P2*(1-P2)
[P1*(1-P1)]/n1
[P2*(1-P2)]/n2
(P1-P2)

67
185
0.3622

Exercise Bike
55
123
0.4472

0.6378
0.5528

1.9600
0.2310
0.2472
0.0012
0.0020
-0.0850

Confidence Interval of Difference between the Proportions
Lower Range
Higher Range

-0....

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Anonymous
Tutor went the extra mile to help me with this essay. Citations were a bit shaky but I appreciated how well he handled APA styles and how ok he was to change them even though I didnt specify. Got a B+ which is believable and acceptable.

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