Refer to the data in Exercise 13.33. (a) Use the Z test for testing the equality of

Question:

Refer to the data in Exercise 13.33.
(a) Use the Z test for testing the equality of two population proportions with a two-sided alternative. Verify the relation x2 = Z2 by comparing their numerical values.
(b) If the alternative is that the incidence rate is lower for the vaccinated group, which of the two tests should be used?
In Exercise 13.33.