A 95% confidence interval infers that the population mean Answer a.is within +/-1.96 standard errors of the mean b. is within +/- 1.645 standard errors of the mean c.is between 0 and 100% d.is too large.

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Lv10

15 Aug 2022

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Priyanshu PatelLv10

25 Feb 2021

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a simple random sample of 60 items resulted in a sample mean of 80. The population standard deviation is 15.

Compute the 95% confidence interval for the population mean.
Assume that the same sample mean was obtained from a sample of 120 items. Provide

a 95% confidence interval for the population mean.
What is the effect of a larger sample size on the interval estimate?