The paper Fudging the Numbers: Distributing Chocolate Influences Student Evaluations of an Undergraduate Course (Teaching of Psychology

Question:

The paper €œFudging the Numbers: Distributing Chocolate Influences Student Evaluations of an Undergraduate Course€ (Teaching of Psychology [2007]: 245€“ 247) describes an experiment in which 98 students at the University of Illinois were assigned at random to one of two groups. All students took a class from the same instructor in the same semester. Students were required to report to an assigned room at a set time to fill out a course evaluation. One group of students reported to a room where they were offered a small bar of chocolate as they entered. The other group reported to a different room where they were not offered chocolate. Summary statistics for the overall course evaluation score are given in the accompanying table.

a. Use the given information to construct and interpret a 95% confidence interval for the mean difference in over-all course evaluation score.
b. Does the confidence interval from Part (a) support the statement made in the title of the paper? Explain.