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  3. a library system lends books for periods of 21 day

A library system lends books for periods of 21 days. This policy is being reevaluated in...

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Statistics

A library system lends books for periods of 21 days. This policyis being reevaluated in view of a possible new loan period thatcould either lengthen or shorten the 21-day period. To aid in thisdecision, book-lending records were consulted to determine the loanperiods actually used by the patrons. A random sample of eightrecords revealed that following loan periods in days: 21, 15, 12,24, 20, 21, 13, and 16. Do the actual loan periods differ from 21days?

a. State your null and alternative hypothesis.
b. Conduct the appropriate test and state your conclusion. c. Whatis the 95% confidence interval? (If applicable)

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