Exam 2: Organizing and Visualizing Variables

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.

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 relative frequency of the third class would be_____ .

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 width of each class?

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 percentage of their customers who are below a certain age,it can use an ogive.

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 100 calls were sampled,of ---- them would have lasted less than 15 minutes.

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 70s among the 40s,50s,60s,70s,80s and 90s.

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?

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_____ .

To determine the width of class interval,divide the number of class groups by the range of the data.

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

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,_____percent of the students in the sample went bar hopping the weekend before the midterm and did well on the midterm.

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 80 or above?

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 did not own a portable Blu-ray player.

In general,grouped frequency distributions should have between 5 and 15 class intervals.

Given below is the scatter plot of the price/earnings ratio versus earnings per share of 20 U.S.companies.There appears to be a negative relationship between price/earnings ratio and earnings per share.

If the values of the seventh and eighth class in a cumulative percentage distribution are the same,we know that there are no observations in the eighth class.

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

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,_____percent of the applicants scored between 20 and below 50.

In a contingency table,the number of rows and columns

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?