Susan Wolch and John Komer are interested in determining which of two books is more effective in teaching statistics to public administration students. They randomly assign a pool of 50 students to two groups of 25 students each. One group uses Meier, Brudney, and Bohte, Applied Statistics for Public and Nonprofit Administration. The other group uses Brand X. Their criterion for measuring success is student grades in the course. They get the results shown in the accompanying table. Evaluate these data and make a recommendation.

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Book Used in Class Brand X Meier Brudney, and Bohte Grade Students receiving C's D's, or Fs Students receiving As, or B's 18 16