Repeat parts (a)-(c) of Exercise 9.191 for a sample size of 20. Compare your power curves for the two sample sizes, and explain the principle being illustrated.
The null and alternative hypotheses obtained in Exercise 9.15 on page 375 are, respectively,
H0: μ = 0.5 ppm
Ha: μ > 0.5 ppm,
Where μ is the mean cadmium level in Boletus pinicola mushrooms.
i. σ = 0.37
ii. α = 0.05
iii. n = 12
iv. μa = 0.55, 0.60, 0.65, 0.70, 0.75, 0.80, 0.85?