Chapter 02:Describing Data Frequency Tables, Frequency Distributions, and Graphic Presentation

Chapter 02:Describing Data Frequency Tables, Frequency Distributions, and Graphic Presentation True / False Questions 1. A frequency distribution groups data into classes showing the number of observations in each class. True False 2. A frequency distribution for qualitative data has class limits. True False 3. To summarize the gender of students attending a college, the number of classes in a frequency distribution depends on the number of students. True False 4. In frequency distributions, classes are mutually exclusive if each individual, object, or measurement is included in only one category. True False 5. In a bar chart, the x-axis is labeled with the values of a qualitative variable. True False 6. In a bar chart, the heights of the bars represent the frequencies in each class. True False 7. The midpoint of a class, which is also called a class mark, is halfway between the lower and upper limits. True False 8. A class interval, or class width, can be determined by subtracting the lower limit of a class from the lower limit of the next higher class. True False 9. To convert a frequency distribution to a relative frequency distribution, divide each class frequency by the sum of the class frequencies. True False 10 To convert a frequency distribution to a relative frequency distribution, . divide each class frequency by the number of classes. True False 11 A pie chart is similar to a relative frequency distribution. . True False 12 A pie chart shows the relative frequency in each class. . True False 13 To construct a pie chart, relative class frequencies are used to graph . the "slices" of the pie. True False 14 A cumulative frequency distribution is used when we want to determine . how many observations lie above or below certain values. True False 15 A frequency polygon is a very useful graphic technique when . comparing two or more distributions. True False Multiple Choice Questions 16 Monthly commissions of first-year insurance brokers are $1,270, . $1,310, $1,680, $1,380, $1,410, $1,570, $1,180 and $1,420. These figures are referred to as a(n) . A. Histogra m B. Raw data C. Frequency distribution D. Frequency polygon 17 A small sample of computer operators shows monthly incomes of . $1,950, $1,775, $2,060, $1,840, $1,795, $1,890, $1,925, and $1,810. What are these ungrouped numbers called? A. Histogra m B. Class limits C. Class frequencies D. Raw data 18 When data is collected using a quantitative, ratio variable, what is true . about a frequency distribution that summarizes the data? A. Upper and lower class limits must be calculated. B. A pie chart can be used to summarize the data. C. Number of classes is equal to the number of variable's values. D. The "5 to the k rule" can be applied. 19 When data is collected using a qualitative, nominal variable, what is . true about a frequency distribution that summarizes the data? A. The upper and lower class limits must be calculated. B. A pie chart can be used to summarize the data. C. The number of classes is equal to the number of variable's values plus 2. D. The "5 to the k rule" can be applied. 20 When data is collected using a qualitative, nominal variable (in other . words, male or female), what is true about a frequency distribution that summarizes the data? A. The upper and lower class limits must be calculated. B. Class midpoints can be computed. C. The number of classes corresponds to the number of a variable's values. D. The "2 to the k rule" can be applied. 21 A student was interested in the cigarette smoking habits of college . students and collected data from an unbiased random sample of students. The data is summarized in the following table: Why is the table NOT a frequency distribution? A. The number of males does not equal the sum of males that smoke and do not smoke. B. The classes are not mutually exclusive. C. There are too many classes. D. Class limits cannot be computed. 22 A student was interested in the cigarette smoking habits of college . students and collected data from an unbiased random sample of students. The data is summarized in the following table: What type of chart best represents the frequency table? A. Bar chart B. Box plot C. Scatter plot D. Frequency polygon 23 A student was interested in the cigarette smoking habits of college . students and collected data from an unbiased random sample of students. The data is summarized in the following table: What type of chart best represents relative class frequencies? A. Box plot B. Pie chart C. Scatter plot D. Frequency polygon 24 When a class interval is expressed as 100 up to 200, . . A. Observations with values of 100 are excluded from the class B. Observations with values of 200 are included in the class C. Observations with values of 200 are excluded from the class D. The class interval is 99