Exam 2: Organizing and Visualizing Data

Given below is the scatter plot of the number of employees and the total revenue ($millions)of 20 U.S.companies.Companies that have higher numbers of employees appear to also have higher total revenue.

You have collected data on the approximate retail price (in $)and the energy cost per year (in $)of 15 refrigerators.Which of the following is the best for presenting the data?

TABLE 2-14 The table below contains the number of people who own a portable DVD player in a sample of 600 broken down by gender. -Referring to Table 2-14,construct a table of total percentages.

When studying the simultaneous responses to two categorical questions,you should set up a

TABLE 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 -Referring to Table 2-2,how many regional offices are represented in the survey results?

TABLE 2-8 The Stem-and-Leaf display represents the number of times in a year that a random sample of 100 "lifetime" members of a health club actually visited the facility. -Referring to Table 2-8,________ of the 100 members visited the health club at least 52 times in a year.

You have collected information on the market share of 5 different search engines used by U.S.Internet users in January 2011.Which of the following is the best for presenting the information?

Histograms are used for numerical data while bar charts are suitable for categorical data.

Given below is the scatter plot of the market value (thousands$)and profit (thousands$)of 50 U.S.companies.Higher market values appear to be associated with higher profits.

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

A histogram can have gaps between the bars,whereas bar charts cannot have gaps.

In a contingency table,the number of rows and columns

TABLE 2-11 The ordered array below resulted from selecting a sample of 25 batches of 500 computer chips and determining how many in each batch were defective. -Referring to Table 2-11,construct a histogram for the defects data,using "0 but less than 5" as the first class.

You have collected data on the number of complaints for 6 different brands of automobiles sold in the US in 2006 and in 2010.Which of the following is the best for presenting the data?

TABLE 2-8 The Stem-and-Leaf display represents the number of times in a year that a random sample of 100 "lifetime" members of a health club actually visited the facility. -Referring to Table 2-8,if a frequency distribution with equal sized classes was made from this data,and the first class was "0 but less than 10," the cumulative percentage of the next-to-last class would be ________.

TABLE 2-11 The ordered array below resulted from selecting a sample of 25 batches of 500 computer chips and determining how many in each batch were defective. -Referring to Table 2-11,construct a cumulative percentage distribution for the defects data if the corresponding frequency distribution uses "0 but less than 5" as the first class.

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

TABLE 2-16 The figure below is the percentage polygon for the amount of calories for a sample of 36 pizzas products where the upper limits of the intervals are: 310,340,370,400 and 430. -Referring to Table 2-16,roughly what percentage of pizza products contains at least 340 calories?

Which of the following is appropriate for displaying data collected on the different brands of cars students at a major university drive?

TABLE 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 Table 2-4,what percentage of the respondents rated overall television quality with a rating of 80 or above?