Question 1

For the following distribution of heights, what are the limits for the class with the greatest frequency?

Accepted Answer

A)  64 and 70 
B)  65 and 69 
C)  65 and 70 
D)  69.5 and 74.5 
A)  64 and 70 
B)  65 and 69 
C)  65 and 70 
D)  69.5 and 74.5

Question 2

(i. Pie charts are useful for showing the percent that various components compose of the total. (ii) Simple bar charts may be constructed either horizontally or vertically.
(iii) A Frequency Polygon is ideal for showing the trend or sales of income over time.

Accepted Answer

A)  (i), (ii) and (iii) are all correct statements. 
B)  (i) and, (ii) are correct statements but not (iii). 
C)  (i) and, (iii) are correct statements but not (ii). 
D)  (ii) and, (iii) are correct statements but not (i). 
E)  (i), (ii) and (iii) are all false statements. 
A)  (i), (ii) and (iii) are all correct statements. 
B)  (i) and, (ii) are correct statements but not (iii). 
C)  (i) and, (iii) are correct statements but not (ii). 
D)  (ii) and, (iii) are correct statements but not (i). 
E)  (i), (ii) and (iii) are all false statements.

Question 3

Refer to the following cumulative frequency distribution on days absent during a calendar year by employees of a manufacturing company:   How many employees were absent six or more days?

Accepted Answer

A)  8 
B)  4 
C)  22 
D)  31 
A)  8 
B)  4 
C)  22 
D)  31

Question 4

Refer to the following chart showing a distribution of exporting firms:   What is the class interval? _____

Accepted Answer

A)  2 
B)  3 
C)  3.5 
D)  4 
A)  2 
B)  3 
C)  3.5 
D)  4

Question 5

The grades on a statistics exam for a sample of students are as follows:   If A + = 90%-100%
A = 80%-89%
B+ = 75%-79%
B = 70%-74%
C+ = 65%-69%
C = 60%-64%
D = 55%-59%
F = 0%-54%
How many student earned a letter grade of C?

Accepted Answer

A)  1 
B)  3 
C)  4 
D)  5 
E)  10 
A)  1 
B)  3 
C)  4 
D)  5 
E)  10

Question 6

The following ages (rounded to the nearest whole year) of employees at a large company that were grouped into a distribution with class limits: 20 up to 30
30 up to 40
40 up to 50
50 up to 60
60 up to 70
(i. The class limits for the class 50 up to 60 class are 50 and 58.
(ii. The midpoint for the class 40 up to 50 is 45.
(iii) The class interval is 9.

Accepted Answer

A)  (i), (ii) and (iii) are all correct statements. 
B)  (i), (ii) and (iii) are all false statements. 
C)  (ii) is correct but not not (i) and (iii). 
D)  (ii) and (iii) are correct statements but not (i). 
A)  (i), (ii) and (iii) are all correct statements. 
B)  (i), (ii) and (iii) are all false statements. 
C)  (ii) is correct but not not (i) and (iii). 
D)  (ii) and (iii) are correct statements but not (i).

Question 7

Refer to the following distribution of commissions:   What is the class interval for the table of commissions above?

Accepted Answer

A)  $200 
B)  $3 
C)  $400 
D)  $1600 
A)  $200 
B)  $3 
C)  $400 
D)  $1600

Question 8

The relative frequency for a class is computed as

Accepted Answer

A)  Class width divided by class interval. 
B)  Class midpoint divided by the class frequency. 
C)  Class frequency divided by the class interval. 
D)  Class frequency divided by the total frequency. 
A)  Class width divided by class interval. 
B)  Class midpoint divided by the class frequency. 
C)  Class frequency divided by the class interval. 
D)  Class frequency divided by the total frequency.

Question 9

When a class interval is expressed as: 100 to under 200 (i) Observations with values of 100 are included from the class frequency.
(ii. Observations with values of 200 are included in the class frequency.
(iii) Observations with values of 200 are excluded from the class frequency.

Accepted Answer

A)  (i), (ii) and (iii) are all correct statements. 
B)  (i) and, (ii) are correct statements but not (iii). 
C)  (i) and, (iii) are correct statements but not (ii). 
D)  (ii) is a correct statement but not (i) or (iii). 
A)  (i), (ii) and (iii) are all correct statements. 
B)  (i) and, (ii) are correct statements but not (iii). 
C)  (i) and, (iii) are correct statements but not (ii). 
D)  (ii) is a correct statement but not (i) or (iii).

Question 10

Refer to the following distribution of commissions:   What are the class limits for the class with the smallest number of frequencies?

Accepted Answer

A)  600 and 800 
B)  800 and1000 
C)  2000 and 2200 
D)  599 and 799 
A)  600 and 800 
B)  800 and1000 
C)  2000 and 2200 
D)  599 and 799

Question 11

(i. A frequency table is a grouping of qualitative data into mutually exclusive classes showing the number of observations in each class. (ii) Simple bar charts may be constructed either horizontally or vertically.
(iii) A relative frequency table shows the fraction or percent of the number of observations in each class.

Accepted Answer

A)  (i), (ii) and (iii) are all correct statements. 
B)  (i) and, (ii) are correct statements but not (iii). 
C)  (i) and, (iii) are correct statements but not (ii). 
D)  (ii) and, (iii) are correct statements but not (i). 
A)  (i), (ii) and (iii) are all correct statements. 
B)  (i) and, (ii) are correct statements but not (iii). 
C)  (i) and, (iii) are correct statements but not (ii). 
D)  (ii) and, (iii) are correct statements but not (i).

Question 12

(i. A table showing the number of observations that have been grouped into each of several classes is called a frequency distribution. (ii) When classes in a frequency table are constructed so that data will fit into only one category, it is called a relative class frequency.
(iii) The suggested class interval based on number of observations given the data ranges from 100 to 200 with 50 observations is 50.

Accepted Answer

A)  (i), (ii) and (iii) are all correct statements. 
B)  (i), (ii) and (iii) are all false statements. 
C)  (i) and (iii) are correct statements but not (ii). 
D)  (i) is a correct statement but not (ii) or (iii). 
A)  (i), (ii) and (iii) are all correct statements. 
B)  (i), (ii) and (iii) are all false statements. 
C)  (i) and (iii) are correct statements but not (ii). 
D)  (i) is a correct statement but not (ii) or (iii).

Question 13

(i. A frequency distribution is grouping of data into classes showing the number of observations in each class. (ii) In constructing a frequency distribution, you should try to have open-ended classes such as "Under $100" and "$1,000 and over".
(iii) A cumulative frequency distribution is used when we want to determine how many observations lie above or below certain values.

Accepted Answer

A)  (i), (ii) and (iii) are all correct statements. 
B)  (i) and, (ii) are correct statements but not (iii). 
C)  (i) and, (iii) are correct statements but not (ii). 
D)  (ii) and, (iii) are correct statements but not (i). 
A)  (i), (ii) and (iii) are all correct statements. 
B)  (i) and, (ii) are correct statements but not (iii). 
C)  (i) and, (iii) are correct statements but not (ii). 
D)  (ii) and, (iii) are correct statements but not (i).

Question 14

What is the class midpoint for the $45 up to $55 class?

Accepted Answer

A)  49 
B)  49.5 
C)  50 
D)  50.5 
A)  49 
B)  49.5 
C)  50 
D)  50.5

Question 15

The following class intervals for a frequency distribution were developed to provide information regarding the starting salaries for students graduating from a particular school:   Before data was collected, someone questioned the validity of this arrangement. Which of the following represents a problem with this set of intervals?

Accepted Answer

A)  there are too many intervals 
B)  the class widths are too small 
C)  some numbers between 18,000 and 30,000 would not fall into any of these intervals 
D)  the first and the second intervals overlap 
E)  the second and third intervals overlap 
A)  there are too many intervals 
B)  the class widths are too small 
C)  some numbers between 18,000 and 30,000 would not fall into any of these intervals 
D)  the first and the second intervals overlap 
E)  the second and third intervals overlap

Question 16

Refer to the following chart showing a distribution of exporting firms:   How many firms export less than $14 million in product?

Accepted Answer

A)  3 
B)  60 
C)  50 
D)  49 
A)  3 
B)  60 
C)  50 
D)  49

Question 17

Refer to the following distribution of commissions:   What is the class midpoint for the class with the greatest frequency?

Accepted Answer

A)  $1400 
B)  $1500 
C)  $1600 
D)  $1700 
A)  $1400 
B)  $1500 
C)  $1600 
D)  $1700

Question 18

(i. For a stem-and-leaf display, the leaf for the value 98 is 9. (ii) There is some loss of information when raw data is tallied into a stem-and-leaf display.
(iii) A cumulative frequency distribution is used when we want to determine how many observations lie above or below certain values.

Accepted Answer

A)  (i), (ii) and (iii) are all correct statements. 
B)  (i) and, (ii) are correct statements but not (iii). 
C)  (i) and, (iii) are correct statements but not (ii). 
D)  (iii) is a correct statement but not (i) or (ii) 
E)  (i), (ii) and (iii) are all false statements. 
A)  (i), (ii) and (iii) are all correct statements. 
B)  (i) and, (ii) are correct statements but not (iii). 
C)  (i) and, (iii) are correct statements but not (ii). 
D)  (iii) is a correct statement but not (i) or (ii) 
E)  (i), (ii) and (iii) are all false statements.

Question 19

What is the relative class frequency for the $25 up to $35 class?

Accepted Answer

A)  2% 
B)  4% 
C)  5% 
D)  10% 
A)  2% 
B)  4% 
C)  5% 
D)  10%

Question 20

Why are unequal class intervals sometimes used in a frequency distribution?

Accepted Answer

A)  To avoid a large number of empty classes 
B)  For the sake of variety in presenting the data 
C)  To make the class frequencies smaller 
D)  To avoid the need for midpoints 
A)  To avoid a large number of empty classes 
B)  For the sake of variety in presenting the data 
C)  To make the class frequencies smaller 
D)  To avoid the need for midpoints

For the following distribution of heights, what are the limits for the class with the greatest frequency?

(i. Pie charts are useful for showing the percent that various components compose of the total. (ii) Simple bar charts may be constructed either horizontally or vertically. (iii) A Frequency Polygon is ideal for showing the trend or sales of income over time.

Refer to the following cumulative frequency distribution on days absent during a calendar year by employees of a manufacturing company: How many employees were absent six or more days?

Refer to the following chart showing a distribution of exporting firms: What is the class interval? _____

The grades on a statistics exam for a sample of students are as follows: If A + = 90%-100% A = 80%-89% B+ = 75%-79% B = 70%-74% C+ = 65%-69% C = 60%-64% D = 55%-59% F = 0%-54% How many student earned a letter grade of C?

Refer to the following distribution of commissions: What is the class interval for the table of commissions above?

The relative frequency for a class is computed as

When a class interval is expressed as: 100 to under 200 (i) Observations with values of 100 are included from the class frequency. (ii. Observations with values of 200 are included in the class frequency. (iii) Observations with values of 200 are excluded from the class frequency.

Refer to the following distribution of commissions: What are the class limits for the class with the smallest number of frequencies?

What is the class midpoint for the $45 up to $55 class?

Refer to the following chart showing a distribution of exporting firms: How many firms export less than $14 million in product?

Refer to the following distribution of commissions: What is the class midpoint for the class with the greatest frequency?

(i. For a stem-and-leaf display, the leaf for the value 98 is 9. (ii) There is some loss of information when raw data is tallied into a stem-and-leaf display. (iii) A cumulative frequency distribution is used when we want to determine how many observations lie above or below certain values.

What is the relative class frequency for the $25 up to $35 class?

Why are unequal class intervals sometimes used in a frequency distribution?

What Is Statistics

Describing Data: Numerical Measures

A Survey of Probability Concepts

Discrete Probability Distributions

Continuous Probability Distributions

Sampling Methods and the Central Limit Theorem

Estimation and Confidence Intervals

One-Sample Tests of Hypothesis

Two-Sample Tests of Hypothesis

Analysis of Variance

Linear Regression and Correlation

Multiple Regression and Correlation Analysis

Chi-Square Applications

Index Numbers

Time Series and Forecasting

An Introduction to Decision Theory

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Exam 2: Describing Data: Frequency Tables, Frequency Distributions, and Graphic Presentation

For the following distribution of heights, what are the limits for the class with the greatest frequency?

(i. Pie charts are useful for showing the percent that various components compose of the total. (ii) Simple bar charts may be constructed either horizontally or vertically. (iii) A Frequency Polygon is ideal for showing the trend or sales of income over time.

Refer to the following cumulative frequency distribution on days absent during a calendar year by employees of a manufacturing company: How many employees were absent six or more days?

Refer to the following chart showing a distribution of exporting firms: What is the class interval? _____

The grades on a statistics exam for a sample of students are as follows: If A + = 90%-100% A = 80%-89% B+ = 75%-79% B = 70%-74% C+ = 65%-69% C = 60%-64% D = 55%-59% F = 0%-54% How many student earned a letter grade of C?

Refer to the following distribution of commissions: What is the class interval for the table of commissions above?

The relative frequency for a class is computed as

When a class interval is expressed as: 100 to under 200 (i) Observations with values of 100 are included from the class frequency. (ii. Observations with values of 200 are included in the class frequency. (iii) Observations with values of 200 are excluded from the class frequency.

Refer to the following distribution of commissions: What are the class limits for the class with the smallest number of frequencies?

What is the class midpoint for the $45 up to $55 class?

Refer to the following chart showing a distribution of exporting firms: How many firms export less than $14 million in product?

Refer to the following distribution of commissions: What is the class midpoint for the class with the greatest frequency?

(i. For a stem-and-leaf display, the leaf for the value 98 is 9. (ii) There is some loss of information when raw data is tallied into a stem-and-leaf display. (iii) A cumulative frequency distribution is used when we want to determine how many observations lie above or below certain values.

What is the relative class frequency for the $25 up to $35 class?

Why are unequal class intervals sometimes used in a frequency distribution?

What Is Statistics

Describing Data: Numerical Measures

A Survey of Probability Concepts

Discrete Probability Distributions

Continuous Probability Distributions

Sampling Methods and the Central Limit Theorem

Estimation and Confidence Intervals

One-Sample Tests of Hypothesis

Two-Sample Tests of Hypothesis

Analysis of Variance

Linear Regression and Correlation

Multiple Regression and Correlation Analysis

Chi-Square Applications

Index Numbers

Time Series and Forecasting

An Introduction to Decision Theory

Filters