Chapter 2: Graphs, Charts, and Tables – Describing Your Data

Business Statistics A decision Making Approach 6th

edition – Self Study Quiz 1

True or false

Chapter 2: Graphs, Charts, and Tables – Describing Your Data

Business Statistics A decision Making Approach 6th

edition – Self Study Quiz 2

Chapter 2: Graphs, Charts, and Tables – Describing Your Data

Business Statistics A decision Making Approach 6th

edition – Self Study Quiz 3

Chapter 2: Graphs, Charts, and Tables – Describing Your Data

Business Statistics A decision Making Approach 6th

edition – Self Study Quiz 4

Answers

1. In a data array, values are sorted in chronological order.

Answer: False

In a data array, values have been sorted in ascending or descending order.

2. If the possible values are countable, the data is discrete.

Answer: True

Continuous data must be measured, but possible values for discrete data are countable.

3. If a frequency distribution has empty classes, the classes are probably too wide.

Answer: False

Having empty classes suggests the classes are too narrow.

4. A good suggestion is to round the class size to a multiple of 3.

Answer: False

Multiples of 2 and 5 are easier to work with.

5. Histograms show where the approximate center of the data is.

Answer: True

A histogram provides a visual indication of where the approximate center of the data is.

6. In a frequency distribution, the vertical axis represents the frequency in each class.

Answer: True

The height of each bar represents the frequency in the class.

7. Look at the Excel Output in Figure 2-10. Of those with a balance from 840 to 989, 41 of the 61

individuals are males.

Answer: True

There are 45 males and 16 females for a total of 61.

8. Histograms are used to represent a frequency distribution associated with qualitative data.

Chapter 2: Graphs, Charts, and Tables – Describing Your Data

Business Statistics A decision Making Approach 6th

edition – Self Study Quiz 5

Answer: False

This is correct for bar charts; histograms, however, are used with quantitative data.

9. In a Pareto chart, the largest category will always be first.

Answer: True

Since categories in Pareto Charts are arranged from highest to lowest, the largest will always be

first.

10. In order to interpret the meaning of a pie chart, the total value of the variable must be known.

Answer: False

Since the size of each slice is proportional to the magnitude of the displayed variable, the total

must be known to create the pie chart. To interpret the meaning, however, one must only compare the

relative sizes of the slices.

11. The size of each slice in a pie chart is determined by the number of categories.

Answer: False

The size of each slice is not determined by the number of categories, but rather, the proportion

each category is to the total.

12. In a pie chart the number of slices will be the same as the number of categories.

Answer: True

Each slice in the chart represents the proportion of that category.

13. In stem & leaf diagrams, the values of the individual data are lost.

Answer: False

Individual values are not lost.

14. On a line chart, time is represented on the horizontal axis.

Answer: True

Time is represented on the horizontal axis and the variable of interest on the vertical axis.

15. A scatter diagram is the graph of paired responses of two quantitative variables.

Answer: True

The values of the two variables are quantitative and arranged in pairs.

Chapter 2: Graphs, Charts, and Tables – Describing Your Data

Business Statistics A decision Making Approach 6th

edition – Self Study Quiz 6

Multiple choices

Chapter 2: Graphs, Charts, and Tables – Describing Your Data

Business Statistics A decision Making Approach 6th

edition – Self Study Quiz 7

Chapter 2: Graphs, Charts, and Tables – Describing Your Data

Business Statistics A decision Making Approach 6th

edition – Self Study Quiz 8

Chapter 2: Graphs, Charts, and Tables – Describing Your Data

Business Statistics A decision Making Approach 6th

edition – Self Study Quiz 9

Answers

1. In order to develop a relative frequency distribution, each frequency count must be divided by:

Answer: the total number of data values.

The relative frequency is the number of items in each category divided by the total number of

data values.

2. The rule-of-thumb for the number of classes in a frequency distribution suggests between 5 and

Your Answer: 20

Between 5 and 20 is the suggested number of classes.

3. Use Sturges' Rule to determine the suggested number of classes when the number of data

values is 55. Round to the nearest whole number.

Answer: 7 which rounds up to 7.

4. The beginnings of a cumulative frequency distribution are presented below. What is the next

number in the Cumulative Frequency column?

Classes Frequency Cumulative Frequency

6.1 to 8 1 1

8.1 to 10 2

10.1 to 12 3

Chapter 2: Graphs, Charts, and Tables – Describing Your Data

Business Statistics A decision Making Approach 6th

edition – Self Study Quiz 10

Answer: 3

Each term in the cumulative frequency represents the sum of all the frequency entries up to that point.

Thus the next term is 3 (ie 1 + 2)

5. Which of the following is not a criterion for determining class size.

Answer: Multiples of 5

The four criteria are: Mutually exclusive classes

All inclusive classes

Equal width

Avoid empty classes

Multiples of two and five were presented only as suggestions because people work better with them.

6. When using Excel to make a histogram, the reason for setting the gap width to zero is:

Answer: Histograms do not have gaps.

Histograms can be used to illustrate continuous or discrete data, but that has nothing to do with

gaps.

7. The data for an ogive is found in which distribution?

Answer: Cumulative Relative Frequency Distribution

The line in an ogive never turns downwards. Ogives illustrate the data found in cumulative

relative frequency distributions.

8. Look at the Excel Output in Figure 2-8. How many males have a balance from 990 to 1139?

Answer: 28

There are 28 males and 8 females.

9. Which of the following is not a characteristic of bar charts?

Answer: Multiple variables must be graphed on separate graphs.

This is not a characteristic of bar charts. Multiple variables may be graphed on the same bar

chart.

10. How are categories arranged in Pareto charts?

Chapter 2: Graphs, Charts, and Tables – Describing Your Data

Business Statistics A decision Making Approach 6th

edition – Self Study Quiz 11

Answer: From highest to lowest

In Pareto Charts categories are arranged from highest to lowest.

11. Which of the following is not a characteristic of stem & leaf diagrams.

Your Answer: Stem values are single digit numbers.

Stem values need not be single digit.

12. Which of the following is true about line charts?

Answer: Straight lines connect consecutive points.

Consecutive points are connected by straight lines.

13. On a scatter diagram, what values are placed on the horizontal axis?

Answer: independent variable

The independent variable is placed on the horizontal axis, and the dependent variable is placed

on the vertical axis.