a. A statistics practitioner formulated the following hypotheses.
H0: µ = 200
H1: µ < 200
And learned that x̄ = 190, n = 9, and σ = 50
Compute the p-value of the test.
b. Repeat part (a) with σ = 30.
c. Repeat part (a) with σ = 10
d. Discuss what happens to the value of the test statistic and its p-value when the standard deviation decreases.