Repeat parts (a)-(c) of Exercise 9.192 for a sample size of 30. Compare your power curves for the two sample sizes, and explain the principle being illustrated.
Refer to Exercise 9.192:
The null and alternative hypotheses obtained in Exercise 9.16 on page 375 are, respectively,
H0: μ ( 23 days
Ha: μ ( 23 days,
Where μ is the mean lactation period of grey seals.
i. σ = 3.0
ii. α = 0.05
iii. n = 14
iv. μa = 20.5, 21.0, 21.5, 22.0, 22.5, 23.5, 24.0, 24.5, 25.0, 25.5