(6.1). 9

You are given the sample mean and the population standard deviation. Use this information to construct the 90% and 95% confidence intervals for the population mean. Interpret the results and compare the widths of the confidence intervals.

From a random sample of

43

business days, the mean closing price of a certain stock was

$112.90.

Assume the population standard deviation is

$9.64.

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Part 1

The 90% confidence interval is

(enter your response here,enter your response here).

(Round to two decimal places as needed.)