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A simple random sample of 60 items resulted in a sample mean of 75. The population...

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Basic Math

A simple random sample of 60 items resulted in a sample mean of75. The population standard deviation is 17.

Compute the 95% confidence interval for the population mean (to1 decimal).

Assume that the same sample mean was obtained from a sample of120 items. Provide a 95% confidence interval for the populationmean (to 2 decimals).

What is the effect of a larger sample size on the margin oferror?

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Solution Given that 75 17a n 60At 95 confidence level the z is 1 95 1 095 005 2 005 2 0025Z2 Z0025    See Answer
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