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1. If the variance of a variable is 80, what is the standard deviation of that variable? Round your final answer to three decimal places.

1. If the variance of a variable is 80, what is the standard deviation of that variable? Round your final answer to three decimal places.

2. In a sample of 94 students the mean quiz score was34 with a standard deviation of3. The distribution was approximately normal.

Compute the standard error of the mean quiz score.Round your answer to three decimal places.

3.Suppose that a 92% confidence interval of 67 plus or minus 12 is constructed to estimate a population mean. What is the margin of error?

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