Let the following sample of 8 observations be drawn from a normal population wit
ID: 3382466 • Letter: L
Question
Let the following sample of 8 observations be drawn from a normal population with unknown mean and standard deviation: 22, 23, 14, 24, 18, 16, 15, 12. Use Table 2.
Calculate the sample mean and the sample standard deviation. (Round intermediate calculations to 4 decimal places, "sample mean" to 3 decimal places and "sample standard deviation" to 2 decimal places.)
Construct the 90% confidence interval for the population mean. (Round "t" value to 3 decimal places, and final answers to 2 decimal places.)
Construct the 99% confidence interval for the population mean. (Round "t" value to 3 decimal places, and final answers to 2 decimal places.)
What happens to the margin of error as the confidence level increases from 90% to 99%?
a.Calculate the sample mean and the sample standard deviation. (Round intermediate calculations to 4 decimal places, "sample mean" to 3 decimal places and "sample standard deviation" to 2 decimal places.)
Explanation / Answer
Let the following sample of 8 observations be drawn from a normal population wit
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