Question: a. Calculate the test statistic when x = 145, s = 50, and n = 100. Use a 5% significance level. H0: = 150

a. Calculate the test statistic when x̄ = 145, s = 50, and n = 100. Use a 5% significance level.

H0: µ = 150

H1: µ < 150

b. Repeat part (a) with x̄ = 140.

c. Repeat part (a) with x̄ = 135.

d. What happens to the t-statistic when the sample mean decreases?


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