Question: Summary: To handle payment processing, we have contracted with the following firms:
• PayAFriend (PAF): an online payments system in which customers and businesses such as ours register in order to exchange payments in a secure and convenient manner without the need for a credit card
• Continental Banking Company (Conbanco): a processing services provider that allows our customers to pay for merchandise using nationally-recognized credit cards issued by a financial institution.
To help reduce costs, I am studying whether to eliminate one of these two systems. I suspect that customers use the two forms of payment in unequal numbers and that customers display different buying behaviors when using the two forms of payment.

Data: I have prepared a random sample of 50 transactions for analysis.