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A simple random sample of 60 items resulted in a sample mean of 70. The population...

A simple random sample of 60 items resulted in a sample mean of 70. The population standard deviation is  = 15.

a. Compute the 95% confidence interval for the population mean. Round your answers to one decimal place.
Enter your answer using parentheses and a comma, in the form (n1,n2). Do not use commas in your numerical answer (i.e. use 1200 instead of 1,200, etc.)

b. Assume that the same sample mean was obtained from a sample of 130 items. Provide a 95% confidence interval for the population mean. Round your answers to two decimal places.

c. What is the effect of a larger sample size on the interval estimate?

  Larger sample provides a - Larger or smaller - margin of error?

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