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  3. 2 a psychofogical siudy that the mean of time remained...

Question: 2 a psychofogical siudy that the mean of time remained...

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2. A psychofogical siudy that the mean of time remained with a science exhibit at a museum was 107 seconds with a standard deviation of 117 seconds. Assume that the 117 seconds represents the population standard deviation. The sample size is 36 and let the confidence level be 95%. found length that boys engaged (a) Find and interpret the margin of error. (b) How large a sample size is needed to estimate to within 30 seconds with 95% confidence?
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