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

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.

Vaccinated Not vaccinated 70 Total Hepatitis No Hepatitis Total 549 534 1083 538 464 81 1002

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