Dutch researchers conducted a study in which two groups of students were asked to answer 42 questions from Trivial Pursuit. The students in group 1 were asked to spend 5 minutes thinking about what it would mean to be a professor, while the students in group 2 were asked to think about soccer hooligans. The 200 students in group 1 had a mean score of 23.4 with a standard deviation of 4.1, while the 200 students in group 2 had a mean score of 17.9 with a standard deviation of 3.9.

(a) Determine the 95% confidence interval for the difference in scores, µ1 - µ2. Interpret the interval.

(b) What does this say about priming?