In reviewing your previous reports, several questions came to Elizabeth Burke’s

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Dec 18, 2022


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In reviewing your previous reports, several questions came
to Elizabeth Burke’s mind. Use point and interval esti-mates to help answer these questions.
1. What proportion of customers rate the company with
“top box” survey responses (which is defined as scale
levels 4 and 5) on quality, ease of use, price, and service
in the Customer Survey worksheet? How do these pro-portions differ by geographic region?
2. What estimates, with reasonable assurance, can PLE give
customers for response times to customer service calls?
3. Engineering has collected data on alternative process
costs for building transmissions in the worksheet Trans-mission Costs. Can you determine whether one of the
proposed processes is better than the current process?
4. What would be a confidence interval for the proportion
of failures of mower test performance as in the work-sheet Mower Test?
5. For the data in the worksheet Blade Weight, what is the
sampling distribution of the mean, the overall mean,
and the standard error of the mean? Is a normal distri-bution an appropriate assumption for the sampling dis-tribution of the mean?
6. How many blade weights must be measured to find
a 95% confidence interval for the mean blade weight
with a sampling error of at most 0.05? What if the sam-pling error is specified as 0.02?
Answer these questions and summarize your results in a
formal report to Ms. Burke. in word document
, include references to the tab names containing data you used to answer the
Elizabeth Burke has identified some additional questions she would like you to answer using the Performance Lawn Equipment Database .
1. Are there significant differences in ratings of specific product / service attributes in the Customer Survey worksheet ?
2. In the worksheet On – Time Delivery , has the proportion of on – time deliveries in 2018 significantly improved since 2014
3. Have the data in the work heet Defects After Delivery changed significantly over the past five years ?
4. Although engineering has collected data on alterna- tive process costs for building transmissions in the worksheet Transmission Costs why didn’t they reach a conclusion as to whether one of the proposed processes is better than the current process ?
5. Are there differences in employee retention due to gen- der , college graduation status , or whether the employee is from the local area in the data in the worksheet Employee Retention ?
Conduct appropriate statistical analyses and hypothe- sis tests to answer these questions and summarize your results in a formal report to Ms. Burke .
in the same word document


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