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A 90% confidence interval for a population mean was reported to be 153 to 159. If...

A 90% confidence interval for a population mean was reported to be 153 to 159. If σ =15, what sample size was used in this study? (Round your answer to next whole number.)

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Answer #1

For 90% confidence critical value of z is 1.645. The margin of error is

159 153 ME =

The sample size will be

= ( )2= (1.64315). rl 67.650625~ 68 ME

Answer: 68

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