Bar and pie charts are graphical techniques for qualitative data. Bar charts focus the attention on the frequency of the occurrences of the categories, and pie charts emphasize the percentage of occurrences of each category.

Twenty-five percent of a sample of 200 professional tennis players indicated that their parents did not play tennis. This is an example of descriptive statistics as opposed to inferential statistics.

Statistical inference is the process of making an estimate, prediction, or decision about a population based on sample data.

Descriptive statistics deals with methods of:

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 a. organizing data

b. summarizing data

c. presenting data in a convenient and informative way

d. all of the above

e. only organizing and summarizing data

The relative frequency of a class is computed by:

Which of the following is not the goal of descriptive statistics?

 a. summarizing data

b. displaying aspects of the collected data

c. reporting numerical findings

d. estimating characteristics of the population based on a sample

e. none of these

You asked ten of your classmates about their weight. Based on this information, you stated that the average weight of all students in your university or college is 158 pounds. This is an example of:

The sum of the frequencies for all classes will always equal:

Two graphical techniques we usually use to present qualitative data are:

A politician who is running for the office of governor of a state with 7 million registered voters commissions a survey. In the survey, 55% of the 10,000 registered voters interviewed say they plan to vote for her. The population of interest is the:

A market share of 78.5 percent would be represented in a pie chart by a slice with a central angle of:

Which of the following statements is true?

a. In constructing a pie chart for a categorical variable, one sector of the pie is assigned to each category of the variable.

b. A bar chart for a categorical variable shows the same distribution of measurements in categories as the pie chart, but with the height of each bar measuring how often a particular category was observed.

c. The categories for a qualitative variable should be chosen so that a measurement will belong to one and only one category, and each measurement has a category to which it can be assigned.

d. In constructing a pie chart for a categorical variable, one sector of the pie is assigned to each category of the variable and a bar chart for a categorical variable shows the same distribution of measurements in categories as the pie chart, but with the height of each bar measuring how often a particular category was observed.

e. All of these.

Identify as either quantitative or qualitative.

The brands of ice cream that you purchase.

Identify as either quantitative or qualitative.

The daily high temperature for the last four weeks.

Identify as either quantitative or qualitative.

The amount of sugar consumed by Americans in one year.

Identify as either quantitative or qualitative.

The species of fish in the zoo.

Identify as either quantitative or qualitative.

The lengths of time children wait for the school bus.

Identify as either quantitative or qualitative.

Your favorite professional football team.

Identify as either quantitative or qualitative.

Rating of the effectiveness of a new cold remedy (Not effective, effective).

Identify as either quantitative or qualitative.

Amount of time spent assembling a five-shelf bookcase.

Identify as either quantitative or qualitative.

Number of children in a beginning swimming class.

Identify each of the following variables as either quantitative or qualitative.

University where a student is enrolled.

Identify the following quantitative variables as discrete or continuous.

Average monthly temperature for a particular city.

Identify the following quantitative variables as discrete or continuous.

Number of employees of a statistical consulting firm that own laptop computers.

Identify the following quantitative variables as discrete or continuous.

Flight time between two cities.

Identify the following quantitative variables as discrete or continuous.

Number of puppies enrolled in an obedience class.

Identify the following quantitative variables as discrete or continuous.

Number of persons on a flight from Chicago to Los Angeles.

Identify the following quantitative variables as discrete or continuous.

Amount of gas purchased at a gas station.

A bar chart in which the bars are ordered from smallest to largest is called a Pareto chart.

A relative frequency distribution describes the proportion of data values that fall within each class, and may be presented in a histogram form.

Compared to the relative frequency histogram, the stem and leaf plot provides more details, since it can describe the individual data values as well as show how many are in each group, or stem.

The difference between a histogram and a bar chart is that the histogram represents quantitative data while the bar chart represents qualitative data.

A pie chart is a portrayal of divisions of some aggregate by a segmented circle in such a way that the sector areas are proportional to the sizes of the divisions in question.

The common graphical presentation of qualitative data is the:

A histogram is a graphical device that is commonly used to analyze:

A bar chart is used to display a

One of the differences between a histogram and bar chart is:

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a. that the bar chart does have gaps between the bars and the histogram does not

b. that the histogram is used to display the distribution of quantitative data and the bar chart is used to display qualitative data

c. that the bars of the bar chart can be reordered and the bars of the histogram cannot

d. all of the above

e. none of these