For over 20 years, movie critics Gene Siskel (formerly of the Chicago Tribune, now deceased) and Roger Ebert

(Chicago Sun-Times) rated the latest film releases on national television, first on PBS with Sneak Previews, then in syndication with At the Movies. University of Florida statisticians examined data on 160 movie reviews by Siskel and Ebert during the period 1995-1996 (Chance, Spring 1997). Each critic's review was categorized as pro ("thumbs up"), con ("thumbs down"), or mixed. Consequently, each movie has a Siskel rating (pro, con, or mixed) and an Ebert rating

(pro, con, or mixed). A summary of the data is provided in the SPSS printout on page 457.

a. Verify that the expected cell counts in the table are accurate.

b. Conduct a test of hypothesis to determine whether the movie reviews of the two critics are independent.

Use a = .01.