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 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:
- Construct a 95 percent confidence interval for the difference between the proportions of service contracts sold on treadmills versus exercise bikes.
- Is there a major difference between the two pieces of equipment? Why or why not?
Unformatted Attachment Preview
Confidence Interval (C.I.) on difference between two proportions
Treadmill
p1
0.362162 Service contract sold
q1
0.637838 Service contract NOT sold
n1
185
Service
contract
67
zc
1.96
95% Confidence Level
sigma(p1)
0.069259
0.292903056
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Explanation & Answer
hello are you there? check at this please and if you need any clarification please let me.
1. From the excel sheet provided we can be able to see that Treadmills with a 95%
confidence interval, we are not going to use the ...
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