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 I were asked
to spend 5 minutes thinking about what it would mean to be a professor , while the students in group ?' were asked to think about soccer hooligans . These pretest
thoughts are a form of priming . The 200 students in group I had a mean score of 26 . 6 with a standard deviation of 5 , while the 200 students in group 2 had a mean
score of 17 . 1 with a standard deviation of 2.8 . Complete parts ( a) and ( b ) below .
( a) Determine the 90% confidence interval for the difference in scores , HI - Ho . Interpret the interval .
The lower bound is\
The upper bound is
' Round to three decimal places as needed . !
Interpret the interval . Choose the correct answer below .
WA . The researchers are 90% confident that the difference of the means is in the interval .
CB . There is a 90% probability that the difference of the means is in the interval .*
CC. The researchers are 90% confident that the difference between randomly selected individuals will be in the interval .
~} D . There is a 90% probability that the difference between randomly selected individuals will be in the interval .
( b ) What does this say about priming ?
A . Since the 90% confidence interval contains zero , the results suggest that priming does not have an effect on scores .
~ B . Since the 90% confidence interval does not contain zero , the results suggest that priming does have an effect on scores .
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