In repeated random samples of this size, the sample mean could be expected to fall within 1.0

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In repeated random samples of this size, the sample mean could be expected to fall within 1.0 of the true mean about 95% of the time.”

(a) Construct and interpret a 95% confidence interval for the mean.

(b) The administrator decides that this interval is too wide, and she prefers one of only half this width for a new study this year. How large a sample size does she need?

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