Marketing of videotapes

40 prospective customers were sent full videotapes and another 40 were sent sample tapes. Which customers then purchased the tape and which returned it?

  Purchased Not purchased
Sample video 6 34
Full video 14 26

Explain that contingency tables can arise from:

Marketing of videotapes
A company that produces and markets videotaped continuing education programs for the financial industry has traditionally mailed sample tapes with previews of the programs to prospective customers. The company was concerned by the number of tapes that were returned without purchase.
There had been some feedback indicating that the sample tapes did not give enough information to prospective buyers, so the sales team decided to investigate whether sending the full tape would increase the number of purchases. Eighty contacts were selected from the mailing list and 40 were randomly selected to be sent the complete tapes; the other 40 received the normal sample tape.
Drug screening of job applicants
The contingency tables show results from urine drug screening for 2537 applicants for career craft positions in the US Postal Service's Boston Management Sectional Center. Several other variables were recorded from each applicant.