Question: Construct a 90% confidence interval to estimate the population mean using the data below. x overbar xequals = 80 80 sigma equals = 10 10

Construct a 90% confidence interval to estimate the population mean using the data below.

x overbar

xequals

=80

80

sigma

equals

=10

10

nequals

=40

40

Nequals

=400

400

The 90% confidence interval for the population mean is left parenthesis nothing comma nothing right parenthesis

,

.

(Round to two decimal places as needed.)

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