statistics

Project Description:

the american bankers association collects data on the use of credit cards, debit cards, personal checks, and cash when consumers pay for in-store purchases. in 1999, the following usages were reported.


in-store purchase percentage
credit card 22
debit card 21
personal check 18
cash 39

a sample taken in 2003 found that 220 in-store purchases, 46 used a credit card, 67 used a debit card, 33 used a personal check, and 74 used cash.
a. at a = 0.01, can we conclude that a change occurred in how customers paid for in-store purchases over the four-year period from 1999 to 2003? what is p-value?
b. compute the percentage of use for each method of payment using the 2003 sample data. what appears to have been the major change or changes over the four-year period?
c. in 2003, what percentage of payments was made using plastic (credit card or debit card)?
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