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One researcher wishes to estimate the mean number of hours that high school students spend watching...

One researcher wishes to estimate the mean number of hours that high school students spend watching TV on a weekday. A margin of error of 0.25 hour is desired. Past studies suggest that a population standard deviation of 1.9 hours is reasonable. Estimate the minimum sample size required to estimate the population mean with the stated accuracy. The required sample size is nothing. ​(Round up to the nearest whole​ number.),

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Answer #1

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Answer:

ME = 0.25

srd ,dev = 1.9

Confidence 95% z value = 1.96

n = (z*std.dev/E)2

=( 1.96 * 1.9 / 0.25)2

= 221.89

~ 222 samples

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