Exam 2: Organizing and Visualizing Variables

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

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_____ .

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

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

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 randomly sampled,----of them would have lasted at least 15 minutes but less than 20 minutes

SCENARIO 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. Defects 1 2 4 4 5 5 6 7 9 9 12 12 15 17 20 21 23 23 25 26 27 27 28 29 29 -Referring to Scenario 2-11,construct a frequency distribution for the defects data,using "0 but less than 5" 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,how many students have a satisfaction level in the 50s?

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 highest level of satisfaction?

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,among the 8 stores,saw a sales decline.

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,construct a percentage histogram for the detergent data,using "9.0 but less than 10.0" as the first class.

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. -The width of each bar in a histogram corresponds to the

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 the students in the population to spend the weekend studying and do poorly on the midterm.

SCENARIO 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. Defects 1 2 4 4 5 5 6 7 9 9 12 12 15 17 20 21 23 23 25 26 27 27 28 29 29 -Referring to Scenario 2-11,construct a histogram for the defects data,using "0 but less than 5" as the first class.

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 percentage of apartments renting for less than $1,400 is_____ .

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 males in the sample,_____percent owned a portable Blu-ray player.

SCENARIO 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. Defects 1 2 4 4 5 5 6 7 9 9 12 12 15 17 20 21 23 23 25 26 27 27 28 29 29 -Referring to Scenario 2-11,if a frequency distribution for the defects data is constructed,using "0 but less than 5" as the first class,the frequency of the "20 but less than 25" 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,if 100 calls were sampled,of ----them would have lasted 20 minutes or more.

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

SCENARIO 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. Defects 1 2 4 4 5 5 6 7 9 9 12 12 15 17 20 21 23 23 25 26 27 27 28 29 29 -Referring to Scenario 2-11,if a frequency distribution for the defects data is constructed,using "0 but less than 5" as the first class,the relative frequency of the "15 but less than 20" class would be_____ .

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,the person who visited the health club less than anyone else in the sample visited the facility_____ times.