# Question

As a basis for a brochure describing the speed of a new computer system, you have measured how long it takes the machine to complete a particular benchmark database program. Since the state of the disks in the database is constantly changing as records are added, changed, and deleted, there is some variation in the test results. Here are times, in minutes, for 14 independent repetitions of this testing procedure:

5, 6, 8, 11, 5, 8, 11, 10, 6, 10, 5, 9, 5, 5

a. Find the two-sided 95% confidence interval and describe its meaning in terms of the long-run mean performance of the system.

b. Find the appropriate one-sided 95% confidence interval, assuming you wish to show off how fast the system is (so that lower numbers are better).

c. Find the appropriate one-sided 90% confidence interval.

d. Find the appropriate one-sided 99% confidence interval.

e. Write a brief paragraph for an advertising brochure describing one (or more) of the preceding results. Be honest, but put your “best foot forward,” and write in ordinary English. Include a technical footnote if necessary so that technically knowledgeable people can tell what you really did.

5, 6, 8, 11, 5, 8, 11, 10, 6, 10, 5, 9, 5, 5

a. Find the two-sided 95% confidence interval and describe its meaning in terms of the long-run mean performance of the system.

b. Find the appropriate one-sided 95% confidence interval, assuming you wish to show off how fast the system is (so that lower numbers are better).

c. Find the appropriate one-sided 90% confidence interval.

d. Find the appropriate one-sided 99% confidence interval.

e. Write a brief paragraph for an advertising brochure describing one (or more) of the preceding results. Be honest, but put your “best foot forward,” and write in ordinary English. Include a technical footnote if necessary so that technically knowledgeable people can tell what you really did.

## Answer to relevant Questions

Samples of rock taken from various places in a proposed mine have been analyzed. For each sample, a “rate of return” number has been computed that represents the profit obtained (by selling the refined metal at the ...The amount of caffeine (milligrams) in randomly sampled cups of coffee was as follows: a. Find the one-sided 99% confidence interval for the population mean caffeine content of a cup of coffee that claims “at ...Viewing the database in Appendix A as a random sample from a much larger population, consider the percentage who are advanced (at training level B or C). Find the 99% confidence interval. Viewing the database in Appendix A as a random sample from a much larger population, consider the annual salary values. a. Find the 95% confidence interval. b. Find the 99% confidence interval. a. Describe the general process of constructing confidence intervals and performing hypothesis tests using the rule of thumb when you have an estimator and its standard error. b. If you also know the number of degrees of ...Post your question

0