In 2006, a sample of 200 in-store shoppers showed that 42 paid by debit card. In 2009,

Question:

In 2006, a sample of 200 in-store shoppers showed that 42 paid by debit card. In 2009, a sample of the same size showed that 62 paid by debit card.
(a) Formulate appropriate hypotheses to test whether the percentage of debit card shoppers increased.
(b) Carry out the test at α = .01.
(c) Find the p-value.
(d) Test whether normality of p1 – p2 may be assumed.