A simple random sample of 60 items resulted in a sample mean of 71. The population standard deviation is 15.

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a. Compute the 95% confidence interval for the population mean (to 1 decimal).

( , )

b. Assume that the same sample mean was obtained from a sample of 120 items. Provide a 95% confidence interval for the population mean (to 2 decimals).

( , )

c. What is the effect of a larger sample size on the margin of error?

**Select**

**It increases**

**It decreases**

**It stays the same**

**It cannot be determined from the given data**

**Item 5**

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