Course Hero Logo
Upload to Study
Expert Help

HW6 - IME 2610 Homework #5 *This assignment is due in class...

Doc Preview
Pages 1
Identified Q&As 9
Total views 29
WeekPoints 113.70 219.40 38.60 48.10 55.70 633.90 IME 2610 Homework #5 *This assignment is due in class on 10/28. Please show work so that partial credited can be awarded. 1. Consider a 95% confidence interval with a standard deviation of 7 and a sample size of 12. A. If the standard deviation was increased to 9 what would happen to the width of the interval? B. If the sample size was changed to 6 what would happen to the width of the interval? C. If the confidence decreased to 90% what would happen to the width of the interval? D. Why is a prediction limit wider than a confidence limit given the same data and same alpha? 4. At a local manufacturing facility that produces mattresses the quality department is in charge
Course Hero Badge

End of preview

Upload your study docs or become a member.
Unformatted text preview:of verifying that quality standards are continuously met. One such standard is average mattress life. Using advanced life cycle testing the quality team tested 40 mattresses. The average life of the samples was 3.2 years with a standard deviation of 8 months. A. Set up a 99% confidence interval of the average life of a mattress. B. Set up a 90% confidence interval of the average life of a mattress. C. What assumptions are necessary to answer the previous two questions? D. What happened to the size of the intervals from A to B? Why?