Exam 2: Organizing and Visualizing Variables

You have collected data on the number of U.S.households actively using online banking and/or online bill payment over a 10-year period.Which of the following is the best for presenting the data?

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 2-4 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 from 50 through 75?

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,what is the cumulative relative frequency for the percentage of calls that lasted 10 minutes or more?

It is essential that each class grouping or interval in a frequency distribution be_____ and_____ .

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,what was the lowest level of satisfaction?

The Guidelines for Developing Visualizations recommend always starting the scale for a vertical axis at zero.

Apple Computer,Inc.collected information on the age of their customers.Suppose the youngest customer was 12 and the oldest was 72.To study the distribution of the age among its customers,it can use a Pareto chart.

SCENARIO 2-6 A sample of 200 students at a Big-Ten university was taken after the midterm to ask them whether they went bar hopping the weekend before the midterm or spent the weekend studying,and whether they did well or poorly on the midterm.The following table contains the result. -Referring to Scenario 2-6,if the sample is a good representation of the population,we can expect _____percent of those who did poorly on the midterm to have spent the weekend studying.

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,the civil suit with the longest wait between when the suit was filed and when it was adjudicated had a wait of _____months.

The Guidelines for Developing Visualizations recommend labeling all axes only when it is possible.

SCENARIO 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 Scenario 2-8,_____of the 100 members visited the health club at least 52 times in a year.

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

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,_____percent of the apartments rented for $1,400 or more.

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 those who did not own a portable Blu-ray player in the sample,_____percent were 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 2-14,construct a table of total percentages.

If you wish to construct a graph of a relative frequency distribution,you would most likely construct an ogive first.

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,_____percent of the 600 were females who either owned or did not own a portable Blu-ray player.

A multidimensional contingency table allows you to tally the responses of more than two continuous 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,if the sample is a good representation of the population,we can expect _____percent of those who own a portable Blu-ray player in the population will be males.