Referring to Exercise 13.10, compare the conclusions of the level = .05 (a) 2 test

Referring to Exercise 13.10, compare the conclusions of the level α = .05
(a) χ² test of homogeneity.
(b) Z test that sales are higher with the modified page.

Data from in Exercise 13.10

A strategy called A/B testing is being implemented by many e-commerce firms. A product web page is modified by adding a picture or other visual change. Then, a fraction of the traffic is routed to the new page. For a sample of 1000 consumers who visit the original page, 70 purchase the item. From a sample of 400 customers who visit the modified site, 42 purchase the item.