Exercise 6-24 presented data on the concentration of suspended solids in lake water.
(a) Test the hypotheses H0: μ = 55 versus, use μ = 0.05.
(b) What is the P-value of the test statistic computed in part (a)?
(c) Compute the power of the test if the true mean concentration is as low as 50.
(d) What sample size would be required to detect a true mean concentration as low as 50 if we wanted the power of the test to be at least 0.9?