The Survey of Study Habits and Attitudes (SSHA) is a psychological test that eva
ID: 3200591 • Letter: T
Question
The Survey of Study Habits and Attitudes (SSHA) is a psychological test that evaluates college students’ motivation, study habits, and attitudes toward school. A private college gives the SSHA to 18 of its incoming first-year women students.
Their scores are (sorted): 101, 103, 109, 115, 126, 126, 129, 137, 137, 140, 148, 152, 154, 154, 165, 165, 178, 200
Find the mean score from the formula for the mean.
That is, add the 18 scores, record the sum, and divide by 18.
The mean score is _____. (Give your answer to 1 decimal place.)
2. The score 200 is an outlier. Use your calculator to find the mean for the 17 observations that remain when you drop the outlier.
The mean score excluding the outlier is _____.
(Give your answer to 1 decimal place.)
3.Your stemplot of the scores suggests that the score 200 is an outlier.
How does the outlier change the mean?
A. The high outlier pulls the mean up.
B. The high outlier pulls the mean down.
C. The high outlier has no affect on the mean.
A. The high outlier pulls the mean up.
B. The high outlier pulls the mean down.
C. The high outlier has no affect on the mean.
Explanation / Answer
1.Find the mean score from the formula for the mean.
by Adding the 18 scores, record the sum, and divide by 18.
we get the mean score is 141.1
2.The mean score excluding the outlier is 137.6
3.How does the outlier change the mean?
the solution is B. The high outlier pulls the mean down.
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