Chapter 4 T F

Front 1

1. A dot plot is an easy way to represent the relationship between two variables.

Back 1

FALSE

Front 2

2. A dot plot is useful for quickly graphing frequencies in a small data set.

Back 2

TRUE

Front 3

3. A dot plot shows the relative symmetry of a distribution.

Back 3

TRUE

Front 4

4. A dot plot is useful for showing possible outliers.

Back 4

TRUE

Front 5

5. A dot plot is useful for showing the range of the data.

Back 5

TRUE

Front 6

6. A stem-and-leaf diagram shows the actual data values.

Back 6

TRUE

Front 7

7. In a stem-and-leaf display, the leaf represents a class of a frequency distribution.

Back 7

FALSE

Front 8

8. In a stem-and-leaf display, the leaf represents the members of a class in a frequency distribution.

Back 8

TRUE

Front 9

9. Quartiles divide a distribution into four equal parts.

Back 9

TRUE

Front 10

10. Quartiles divide a distribution into ten equal parts.

Back 10

FALSE

Front 11

11. Percentiles divide a distribution into one hundred equal parts.

Back 11

TRUE

Front 12

12. A student scored in the 85th percentile on a standardized test. This means that the student scored lower than 85% of all students who took the test.

Back 12

FALSE

Front 13

13. The 50th percentile of a distribution is the same as the distribution mean.

Back 13

FALSE

Front 14

14. A box plot graphically shows the 10th and 90th percentiles.

Back 14

FALSE

Front 15

15. The "box" in a box plot shows the interquartile range.

Back 15

TRUE

Front 16

16. A box plot shows the relative symmetry of a distribution.

Back 16

TRUE

Front 17

17. The coefficient of skewness is the standard deviation divided by the mean.

Back 17

FALSE

Front 18

18. Pearson's coefficient of skewness is a measure of a distribution's symmetry.

Back 18

TRUE

Front 19

19. If a distribution is negatively skewed, the distribution is not symmetrical and the long tail is to the left.

Back 19

TRUE

Front 20

20. A scatter diagram of sales versus production is labeled with sales on the Y-axis and production on the X-axis.

Back 20

TRUE

Front 21

21. A scatter diagram of sales versus production may be constructed by plotting the minimum, first quartile, median, third quartile, and the maximum values of each variable.

Back 21

FALSE

Front 22

22. A relationship between gender and preference for Coke or Pepsi can be best represented by a scatter diagram.

Back 22

FALSE

Front 23

23. A relationship between two nominal variables is summarized by a contingency table.

Back 23

TRUE