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Here are summary statistics for randomly selected weights of newborn girls: n=243, x̅=32.8 hg, s=7.1 hg....

Here are summary statistics for randomly selected weights of newborn girls: n=243, x̅=32.8 hg, s=7.1 hg. Construct a confidence interval estimate of the mean. Use a 98% confidence level.

What is the confidence interval for the population mean μ?

Math   Statistics-And-Probability   
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Answer #1

Since the sample is large (sample size of 30 or more), the central limit theorem tells us that the sampling distribution of the sample means is approximately normal.

Refer Standard normal table/Z-table or use excel function "=NORM.S.INV((1-0.01))" to find the Z-value.

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