Two researchers conducted a study in which two groups of students were asked to answer 42 trivia questions from a board game. 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. These pretest thoughts are a form of priming. The 200 students in group 1 had a mean score of 26.3 with a standard deviation of 4.9, while the 200 students in group 2 had a mean score of 15.9 with a standard deviation of 2.5.
Determine the 95% confidence interval for the difference in scores,?1 - ?2: (__, __) (Round the variables to three decimal places as needed.)
A. (9.028, 11.572)
B. (9.328, 11.112)
C. (9.128, 11.102)
D. (9.628, 11.172)
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