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Determine the critical value or values for a one-meanz -test at the20% significance level if the hypothesis test is left-tailed (H a : < 0

Determine the critical value or values for a one-meanz

-test at the20%

significance level if the hypothesis test isleft-tailed(H

a

:<

0

).

z

0.8

0.842

z

0.4

0.253

z

0.2

0.842

z

0.1

1.282

z

0.05

1.645

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