MULTIPLE CHOICE QUESTIONS

1. The relative frequency of a class is computed by a. dividing the midpoint of the class by the sample size b. dividing the frequency of the class by the midpoint c. dividing the sample size by the frequency of the class d. dividing the frequency of the class by the sample size Answer: d

3. The sum of frequencies for all classes will always equal a. 1 b. the number of elements in a data set c. the number of classes d. a value between 0 and 1 Answer: b

5. A researcher is gathering data from four geographical areas designated: South = 1; North = 2; East = 3; West = 4. The designated geographical regions represent a. qualitative data b. quantitative data c. label data d. either quantitative or qualitative data Answer: a

7. A tabular summary of a set of data showing the fraction of the total number of items in several classes is a a. frequency distribution b. relative frequency distribution c. frequency d. cumulative frequency distribution Answer: b

9. If several frequency distributions are constructed from the same data set, the distribution with the widest class width will have the a. fewest classes b. most classes c. same number of classes as the other distributions since all are constructed from the same data Answer: a

11. The sum of the percent frequencies for all classes will always equal a. one b. the number of classes c. the number of items in the study d. 100 Answer: d

13. The total number of data items with a value less than the upper limit for the class is given by the a. frequency distribution b. relative frequency distribution c. cumulative frequency distribution d. cumulative relative frequency distribution Answer: c

Exhibit 2-1

The numbers of hours worked (per week) by 400 statistics students are shown below.

Number of hours