Above is a cumulative relative frequency plot for the scores of a large university class on a 90-
point statistics exam. Which of the following observations is correct?
A. The median score is at least 60 points.
B. The distribution of scores is skewed to the right.
C. The distribution of scores is skewed to the left.
D. The distribution is roughly symmetric.
E. If a passing score is 60, most students passed the test.
- Self-efficacy (the belief that one has control over one’s situation) as it related to job satisfaction
was studied. When a group of teachers rated their ability to control their situation and their
satisfaction with their job, the two variables had a correlation of 0.30. Which statement follows
from this correlation?
A. If you want teachers to be happy with their job, give them more control over their situation.
B. If you want teachers to take more control over their situation, make them happier at their jobs.
C. Teachers in the study who were more satisfied with their job were less confident in their
ability to control their situation.
D. There is evidence of a causal relationship.
E. 9% of the variability in job satisfaction can be explained by the linear model with self-efficacy
as a predictor. - A university sent out a survey to a random sample of 120 recent graduates to see how those
graduates feel about the education they received. Thirty-two of the graduates did not respond to the
survey. Which of these would be the best way to proceed?
A. Use the 88 who did respond, using 88 as the sample size in the analysis.
B. Use the 88 who did respond, using 120 as the sample size in the analysis.
C. Attempt to contact the 32 who did not respond and get the information from them.
D. Select 32 more graduates at random and use them to replace the nonresponders.
E. Start over, sending the survey to more graduates to increase the number of responses. - Some health professionals suspect that doctors are more likely to order cardiac tests for men than
women, even when women describe exactly the same symptoms. Young doctors, training to work in
the emergency room, were randomly assigned to two groups—Group A and Group B—and
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