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 70. The population standard deviation is

= 10.

(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 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.