A simple random sample of 60 items resulted in a sample mean of 80. The population standard deviation is o = 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 120 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? O A larger sample size does not change the margin of error. O A larger sample size provides a smaller margin of error. A larger sample size provides a larger margin of error.

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A simple random sample of 60 items resulted in a sample mean of 80. The population standard deviation is o = 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 120 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 does not change the margin of error.
A larger sample size provides a smaller margin of error.
A larger sample size provides a larger margin of error.
Transcribed Image Text:A simple random sample of 60 items resulted in a sample mean of 80. The population standard deviation is o = 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 120 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 does not change the margin of error. A larger sample size provides a smaller margin of error. A larger sample size provides a larger margin of error.
Expert Solution
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a)Givensample size(n)=60Mean(x)=80standard deviation(σ)=15

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