Exam 2: Organizing and Visualizing Variables

Data on the number of credit hours of 20,000 students at a public university enrolled in a Spring semester were collected.Which of the following is the best for presenting the information?

SCENARIO 2-10 The histogram below represents scores achieved by 200 job applicants on a personality profile. -Referring to the histogram from Scenario 2-10, half of the job applicants scored below ________.

A multidimensional contingency table allows you to tally the responses of more than two categorical variables.

The sum of cumulative frequencies in a distribution always equals 1.

SCENARIO 2-13 Given below is the stem-and-leaf display representing the amount of detergent used in gallons (with leaves in 10ths of gallons)in a day by 25 drive-through car wash operations in Phoenix. -Referring to Scenario 2-13, construct a percentage polygon for the detergent data if the corresponding frequency distribution uses "9.0 but less than 10.0" as the first class.

SCENARIO 2-18 The stem-and-leaf display below shows the result of a survey on 50 students on their satisfaction with their school with the higher scores represent higher level of satisfaction. -Referring to Scenario 2-18, if a student is randomly selected, his/her most likely level of satisfaction will be in the 60s among the and 90s.

SCENARIO 2-5 The following are the duration in minutes of a sample of long-distance phone calls made within the continental United States reported by one long-distance carrier. -Referring to Scenario 2-5, if 10 calls lasted 30 minutes or more, how many calls lasted less than 5 minutes?

Determining the class boundaries of a frequency distribution is highly subjective.

In general, a frequency distribution should have at least 8 class groups but no more than 20.

SCENARIO 2-12 The table below contains the opinions of a sample of 200 people broken down by gender about the latest congressional plan to eliminate anti-trust exemptions for professional baseball. -Referring to Scenario 2-12, if the sample is a good representation of the population, we can expect _______ percent of the males in the population will be against the plan.

SCENARIO 2-4 A survey was conducted to determine how people rated the quality of programming available on television.Respondents were asked to rate the overall quality from 0 (no quality at all)to 100 (extremely good quality).The stem-and-leaf display of the data is shown below. -Referring to Scenario 2-4, what percentage of the respondents rated overall television quality with a rating of 50 or below?

In graphing two categorical data, the side-by-side bar chart is best suited when comparing joint responses.

SCENARIO 2-12 The table below contains the opinions of a sample of 200 people broken down by gender about the latest congressional plan to eliminate anti-trust exemptions for professional baseball. -Referring to Scenario 2-12, ________ percent of the 200 were males who were neutral.

The Guidelines for Developing Visualizations recommend using varying scale to conserve precious space whenever possible.

When constructing a frequency distribution, classes should be selected so that they are of equal width.

When constructing charts, the following is plotted at the class midpoints:

SCENARIO 2-18 The stem-and-leaf display below shows the result of a survey on 50 students on their satisfaction with their school with the higher scores represent higher level of satisfaction. -Referring to Scenario 2-18, the level of satisfaction is concentrated around 75.

SCENARIO 2-9 The frequency distribution below represents the rents of 250 randomly selected federally subsidized apartments in a small town. -Referring to Scenario 2-9, the relative frequency of the second class is ________.

SCENARIO 2-2 At a meeting of information systems officers for regional offices of a national company, a survey was taken to determine the number of employees the officers supervise in the operation of their departments, where X is the number of employees overseen by each information systems officer and f is the number of officers for each X. -Referring to Scenario 2-2, across all the regional offices, how many total employees were supervised by those surveyed?

The Guidelines for Developing Visualizations recommend avoiding uncommon chart type such as doughnut, radar, cone and pyramid charts.