Question

You may need to use the appropriate appendix table or technology to answer this question. A simple random sample of 80 items resulted in a sample mean of 90. The population standard deviation is ? = 15. (a) Compute the 95% confidence interval for the population mean. (Round your answers to two decimal places.) to (b) Assume that the same sample mean was obtained from a sample of 160 items. Provide a 95% confidence interval for the population mean. (Round your answers to two decimal places.) to (c) What is the effect of a larger sample size on the interval estimate? A larger sample size provides a smaller margin of error. A larger sample size provides a larger margin of error. A larger sample size does not change the margin of error.

          You may need to use the appropriate appendix table or technology to answer this question.

A simple random sample of 80 items resulted in a sample mean of 90. The population standard deviation is ? = 15.

(a) Compute the 95% confidence interval for the population mean. (Round your answers to two decimal places.)
to

(b) Assume that the same sample mean was obtained from a sample of 160 items. Provide a 95% confidence interval for the population mean. (Round your answers to two decimal places.)
to

(c) What is the effect of a larger sample size on the interval estimate?
A larger sample size provides a smaller margin of error.
A larger sample size provides a larger margin of error.
A larger sample size does not change the margin of error.

You may need to use the appropriate appendix table or technology to answer this question.

A simple random sample of 80 items resulted in a sample mean of 90. The population standard deviation is ? = 15.

(a) Compute the 95% confidence interval for the population mean. (Round your answers to two decimal places.)
to

(b) Assume that the same sample mean was obtained from a sample of 160 items. Provide a 95% confidence interval for the population mean. (Round your answers to two decimal places.)
to

(c) What is the effect of a larger sample size on the interval estimate?
A larger sample size provides a smaller margin of error.
A larger sample size provides a larger margin of error.
A larger sample size does not change the margin of error.

Added by Samuel C.

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