Question 293699
In 1999, a sample of 200 in-store shoppers showed that 42 paid by debit card.
p'1 = 0.21
-------------------------------
In 2004, a sample of the same size showed that 62 paid by debit card.
p'2 = 0.31 
-------------------------------
(a) Formulate appropriate hypotheses to test whether the percentage of debit card shoppers increased.
Ho: p'2-p'1 = 0
Ha: p'2-p'1 > 0 
-------------------------------
(b) Carry out the test at α = .01
I ran a 2-PropZtest and got:
test stat = 2.2798
-----------------------------------------
(c) Find the p-value: 0.01131
Conclusion: Since p-value is greater than 1%, fail to reject Ho. 
-------------------------------
(d) Test whether normality may be assumed.
I'll leave that to you.
====================================
Cheers,
Stan H.