3.2 Intro to Contingency Tables

Contingency Table from a graph: Let’s reorganize our data to see what’s happening here… Take the data from the graph and write it in the table shown: AerobicsSquashWeights Male Female How many males chose weightlifting? How many females did not choose aerobics? What proportion of the females chose aerobics? What proportion of the subjects were female AND chose squash?

Contingency Table from Paragraph form 56 college freshmen were interviewed and asked whether they were currently “dieting”. Out of the 32 women, 11 stated that they were NOT dieting. Out of the men, 21 stated that they were NOT dieting. DietingNOT Dieting TOTAL Women Men Compute the conditional proportions for the table also. Describe what you see as the results.

Drop the Phone! Traffic Ticket NO Traffic Tickets TOTAL Cell Phone User Not a Cell Phone User TOTAL What percent of cell phone users have a traffic ticket? What percent of NON cell phone users have a traffic ticket? What percent of ALL subjects have a traffic ticket?

Cause? Correlation? So… Does using a cell phone cause traffic tickets? Could there be a lurking variable? What?