In Problems 9.52 and 9.53, suppose you are testing the null H0: = 0.20 hypothesis against

In Problems 9.52 and 9.53, suppose you are testing the null H0: π = 0.20 hypothesis against the two-tail alternative hypothesis H1: π ≠ 0.20 and you choose the level of significance α = 0.05. What is your statistical decision?
In problem 9.53
In Problem 9.52, if the null hypothesis is that 20% of the items in the population are defective, what is the value of ZSTAT?
In problem 9.52
If, in a random sample of 400 items, 88 are defective, what is the sample proportion of defective items?