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You calculate a one-tailed z-test and find that for your study, z = 1.40, p >...

You calculate a one-tailed z-test and find that for your study, z = 1.40, p > .05.

A. What is the proportion of the curve that is in the critical region?

B. Is this a Type I or Type II error?

C. Do you reject or fail to reject the null hypothesis?

D. What is the confidence interval?

For a normal distribution with a population mean μ of 80 and a population standard deviation (σ) of 50, find each probability value for a sample size (n) of 30. Round all answers to 4 decimal points and show your work to receive credit.

P (X < 55) =

P (X < 60 < 90) =

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