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I need to find...

I need to find the sample mean, sample standard deviation, and construct a 90% confidence interval for the population mean

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The monthly incomes for 12 randomly selected people, each with a bachelor's degree in economics, are shown on the right. Complete parts (a) through (c) below.

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(a) Find the sample mean.

x overbarequals

nothing (Round to one decimal place as needed.)

(b) Find the sample standard deviation.

sequals

nothing (Round to one decimal place as needed.)

(c) Construct a 90% confidence interval for the population mean mu.

A 90% confidence interval for the population mean is (

nothing,

nothing).

(Round to one decimal place as needed.)

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