Exam 2: Organizing and Visualizing Variables

The relative frequency is the frequency in each class divided by the total number of observations.

A good choice for the number of class groups to use in constructing frequency distribution is to have at least 5 but no more than 15 class groups.

The stem-and-leaf display is often superior to the frequency distribution in that it maintains the original values for further analysis.

SCENARIO 2-17 The following table presents total retail sales in millions of dollars for the leading apparel companies over a two-year period in the past. Organizing and Visualizing Variables 2-45 -Referring to Scenario 2-17,construct a table of column percentages.

SCENARIO 2-14 The table below contains the number of people who own a portable Blu-ray player in a sample of 600 broken down by gender. -Referring to Scenario 2-14,if the sample is a good representation of the population,we can expect_____ percent of the population will be males.

SCENARIO 2-14 The table below contains the number of people who own a portable Blu-ray player in a sample of 600 broken down by gender. -Referring to Scenario 2-13,if a percentage histogram for the detergent data is constructed,using "9.0 but less than 10.0 gallons" as the first class,the percentage of drive-through car wash operations that use "12.0 but less than 13.0 gallons" of detergent would be_____ .

The point halfway between the boundaries of each class interval in a grouped frequency distribution is called the_____ .

SCENARIO 2-7 The Stem-and-Leaf display below contains data on the number of months between the date a civil suit is filed and when the case is actually adjudicated for 50 cases heard in superior court. -Referring to Scenario 2-7,if a frequency distribution with equal sized classes was made from this data,and the first class was "10 but less than 20," the cumulative percentage of the second class would be_____ .

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

SCENARIO 2-14 The table below contains the number of people who own a portable Blu-ray player in a sample of 600 broken down by gender. -Referring to Scenario 2-14,construct a table of row percentages.

An ogive is a cumulative percentage polygon.

The Guidelines for Developing Visualizations recommend always including a scale for each axis if the chart contains axes.

You have collected data on the number of complaints for 6 different brands of automobiles sold in the US over a 10-year period.Which of the following is the best for presenting the data?

SCENARIO 2-2 2-2 Organizing and Visualizing Variables 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. -Referring to Scenario 2-2,how many regional offices are represented in the survey results?

SCENARIO 2-7 The Stem-and-Leaf display below contains data on the number of months between the date a civil suit is filed and when the case is actually adjudicated for 50 cases heard in superior court. -Referring to Scenario 2-7,_____percent of the cases were not adjudicated within the first 4 years.

SCENARIO 2-14 The table below contains the number of people who own a portable Blu-ray player in a sample of 600 broken down by gender. -Referring to Scenario 2-14,of the females in the sample,_____percent did not own a portable Blu-ray player.

A research analyst was directed to arrange raw data collected on the yield of wheat,ranging from 40 to 93 bushels per acre,in a frequency distribution.He should choose 30 as the class interval width.

The main principle behind the Pareto chart is the ability to separate the "vital few" from the "trivial many."

Given below is the scatter plot of the number of employees and the total revenue ($millions)of 20 U.S.companies.There appears to be a positive relationship between total revenue and the number of employees.

The original data values cannot be determined once they are grouped into a frequency distribution table.