The article Computer-Assisted Instruction Augmented with

Chapter 10, Problem 10.36

(choose chapter or problem)

The article Computer-Assisted Instruction Augmented with Planned Teacher/Student Contacts (J. Exp. Educ., Winter, 19801981: 120126) compared five different methods for teaching descriptive statistics. The five methods were traditional lecture and discussion (L/D), programmed textbook instruction (R), programmed text with lectures (R/L), computer instruction (C), and computer instruction with lectures (C/L). Forty-five students were randomly assigned, 9 to each method. After completing the course, the students took a 1-hour exam. In addition, a 10-minute retention test was administered 6 weeks later. Summary quantities are given. Exam Retention TestMethod xisi xisiL/D 29.3 4.99 30.20 3.82R 28.0 5.33 28.80 5.26R/L 30.2 3.33 26.20 4.66C 32.4 2.94 31.10 4.91C/L 34.2 2.74 30.20 3.53The grand mean for the exam was 30.82, and the grandmean for the retention test was 29.30.a. Does the data suggest that there is a difference among thefive teaching methods with respect to true mean examscore? Use .05.b. Using a .05 significance level, test the null hypothesis ofno difference among the true mean retention test scoresfor the five different teaching methods.