You may need to use the appropriate appendix table or technology to answer this question. A simple random sample of 60 items resulted in a sample mean of 90. The population standard deviation is σ = 5. (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 larger margin of error.     A larger sample size provides a smaller margin of error.

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