Question: see attached 5 5 (10 pts) In sampling from a normal population with both / and of unknown, how large a sample must be drawn

see attached 5

5 (10 pts) In sampling from a normal population with both / and of unknown, how large a sample must be drawn to make the probability 0.95 that a 90 percent confidence interval for / will have a length less than ? (notice that the length of the confidence interval is upper limit minus the lower limit)

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