Question 1

For the following observations, plot a scatter diagram and indicate what kind of relationship (if any) exist between x and y.

Accepted Answer

The answer of For the following observations, plot a scatter...

Question 2

Categorical data can be graphically represented by using a(n)

Accepted Answer

A) histogram 
B) frequency polygon 
C) ogive 
D) bar chart

Question 3

When a histogram has a longer tail to the right, it is said to be

Accepted Answer

A) symmetrical 
B) skewed to the left 
C) skewed to the right 
D) none of these alternatives is correct

Question 4

A tabular summary of a set of data showing the fraction of the total number of items in several classes is a

Accepted Answer

A) frequency distribution 
B) relative frequency distribution 
C) frequency 
D) cumulative frequency distribution

Question 5

A frequency distribution is

Accepted Answer

A) a tabular summary of a set of data showing the relative frequency 
B) a graphical form of representing data 
C) a tabular summary of a set of data showing the frequency of items in each of several nonoverlapping classes 
D) a graphical device for presenting categorical data

Question 6

In constructing a frequency distribution, the approximate class width is computed as

Accepted Answer

A) (largest data value - smallest data value)/number of classes 
B) (largest data value - smallest data value)/sample size 
C) (smallest data value - largest data value)/sample size 
D) largest data value/number of classes

Question 7

Exhibit 2-1
The numbers of hours worked (per week) by 400 statistics students are shown below.
 
-Refer to Exhibit 2-1. The relative frequency of students working 9 hours or less

Accepted Answer

A) is 20 
B) is 100 
C) is 0.95 
D) 0.05

Question 8

The relative frequency of a class is computed by

Accepted Answer

A) dividing the cumulative frequency of the class by n 
B) dividing n by cumulative frequency of the class 
C) dividing the frequency of the class by n 
D) dividing the frequency of the class by the number of classes

Question 9

Exhibit 2-2
A survey of 800 college seniors resulted in the following crosstabulation regarding their undergraduate major and whether or not they plan to go to graduate school.
 
-Refer to Exhibit 2-2. Among the students who plan to go to graduate school, what percentage indicated "Other" majors?

Accepted Answer

A) 15.75 
B) 45 
C) 54 
D) 35

Question 10

In a cumulative frequency distribution, the last class will always have a cumulative frequency equal to

Accepted Answer

A) one 
B) 100% 
C) the total number of elements in the data set 
D) None of these alternatives is correct.

Question 11

Twenty employees of the Ahmadi Corporation were asked if they liked or disliked the new district manager. Below you are given their responses. Let L represent liked and D represent disliked.  
a.Construct a frequency distribution and a bar chart.
b.Construct a relative frequency distribution and a pie chart.

Accepted Answer

The answer of Twenty employees of the Ahmadi Corporation were...

Question 12

Exhibit 2-2
A survey of 800 college seniors resulted in the following crosstabulation regarding their undergraduate major and whether or not they plan to go to graduate school.
 
-Refer to Exhibit 2-2. What percentage of the students' undergraduate major is engineering?

Accepted Answer

A) 292 
B) 520 
C) 65 
D) 36.5

Question 13

Exhibit 2-3
Michael's Compute-All, a national computer retailer, has kept a record of the number of laptop computers they have sold for a period of 80 days. Their sales records are shown below:
Number of Laptops Sold Number of Days
0 - 19 5
20 - 39 15
40 - 59 30
60 - 79 20
80 - 99 10
Total 80
-Refer to Exhibit 2-3. The lower limit of the first class is

Accepted Answer

A) 5 
B) 80 
C) 0 
D) 20

Question 14

In a cumulative percent frequency distribution, the last class will have a cumulative percent frequency equal to

Accepted Answer

A) one 
B) 100 
C) the total number of elements in the data set 
D) None of these alternatives is correct.

Question 15

Fifteen percent of the students in a school of Business Administration are majoring in Economics, 20% in Finance, 35% in Management, and 30% in Accounting. The graphical device(s) which can be used to present these data is (are)

Accepted Answer

A) a line chart 
B) only a bar chart 
C) only a pie chart 
D) both a bar chart and a pie chart

Question 16

Exhibit 2-3
Michael's Compute-All, a national computer retailer, has kept a record of the number of laptop computers they have sold for a period of 80 days. Their sales records are shown below:
Number of Laptops Sold Number of Days
0 - 19 5
20 - 39 15
40 - 59 30
60 - 79 20
80 - 99 10
Total 80
-Refer to Exhibit 2-3. The percentage of days in which the company sold at least 40 laptops is

Accepted Answer

A) 37.5% 
B) 62.5% 
C) 90.0% 
D) 75.0%

Question 17

Forty shoppers were asked if they preferred the weight of a can of soup to be 6 ounces, 8 ounces, or 10 ounces. Below you are given their responses.
  
a.Construct a frequency distribution and graphically represent the frequency distribution.
b.Construct a relative frequency distribution and graphically represent the relative frequency distribution.

Accepted Answer

The answer of Forty shoppers were asked if they preferred...

Question 18

Thirty students in the School of Business were asked what their majors were. The following represents their responses (M = Management; A = Accounting; E = Economics; O = Others).
  
a.Construct a frequency distribution and a bar chart.
b.Construct a relative frequency distribution and a pie chart.

Accepted Answer

The answer of Thirty students in the School of Business...

Question 19

The sum of frequencies for all classes will always equal

Accepted Answer

A) 1 
B) the number of elements in a data set 
C) the number of classes 
D) a value between 0 and 1

Question 20

A histogram is

Accepted Answer

A) a graphical presentation of a frequency or relative frequency distribution 
B) a graphical method of presenting a cumulative frequency or a cumulative relative frequency distribution 
C) the history of data elements 
D) the same as a pie chart

Exam 2: Descriptive Statistics: Tabular and Graphical Presentations