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The monthly incomes for 12 randomly selected people, each with a bachelor's degree in economics, are...

The monthly incomes for 12 randomly selected people, each with a bachelor's degree in economics, are shown on the right. Assume the population is normally distributed.

4450.05 4596.92 4366.61

4455.37 4151.57 3727.23

4283.06 4527.88 4407.04

3946.17 4023.04 4221.01

a)find the sample mean(round to one decimal)

b)find the sample standard deviation(round to one decimal

c) Construct a 99% confidence interval for the population mean, (____,____)

Math   Statistics-And-Probability   
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