Sleep researcher Chris Winter, MD, had just finished compiling "jet lag" and game outcome data for 22,855 Major League Baseball games over a nine-year span. His interest was to see whether jet lag affected which team won/lost professional baseball games. Was the win percentage higher for the team that was less jet lagged? And if it was higher, was the difference significant enough to warrant publication?
Students are given an Excel spreadsheet with 43,710 rows of data (each game appears twice, one from each team's point of view), and asked to use these data to answer the research questions.