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Elementary Statistics

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CHAPTER 3

Describing Data: Numerical

Multiple-Choice Questions

1. A scatter plot can illustrate all of the following except:

A) The median of each of the variables. B) The range of each of the variables. C) An indication of outliers. D) Patterns of values. ANSWER: A

2. For the following scatter plot, what would be your best estimate of the correlation coefficient?

A) -0.8 B) -1.0 C) -0.3 D) 0.0 ANSWER: A

3. For the following scatter plot, what would be your best estimate of the correlation coefficient?

A) 1.0 B) 0.8 C) 0.3 D) 0.0 ANSWER: B

4. Calculate the correlation for the following (X, Y) data: (53, 37), (34, 26), (10, 29), (63, 55), (28, 36), (58, 48), (28, 41), (50, 42), (39, 21), and (35, 46).

A) 0.710 B) 100.6 C) 0.670 D) 0.590 ANSWER: D

5. Suppose that we are interested in exploring the determinants of successful high schools. One possible measure of success might be the percentage of students who go on to college. The teachers’ union argues that there should be a relationship between the average teachers’ salary and high school success. The following equation of the regression line is obtained: “% of students going on to college = 13 + 0.001Average Teachers’ Salary” Which of the following statements is true?

A) Increase % of students going on to college by 0.001 percent, we would expect average teacher’s salary to increase by one dollar. B) Increase % of students going on to college by one percent, we would expect average teacher’s salary to increase by 0.001 dollar. C) Increase teacher’s average salary by 0.001 dollar, we would expect % of students going on to college to increase by one percent. D) Increase average teacher’s salary by one dollar, we would expect % of students going...

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