Question 1

Refer to the following distribution of commissions:  The first plot for a cumulative greater than frequency distribution should be:

Accepted Answer

A)  X = 0,Y = 600. 
B)  X = 600,Y = 3. 
C)  X = 3,Y = 600. 
D)  X = 600,Y = 120.

Question 2

A group of 100 students were surveyed about their interest in a new International Studies program. The survey asked students about their interest in the program in terms of high, medium, or low. 30 students responded high interest; 50 students responded medium interest; 20 students responded low interest. What is the relative frequency of students with high interest?

Accepted Answer

A)  30% 
B)  50% 
C)  20% 
D)  Cannot be determined.

Question 3

In a frequency distribution, what is the number of observations in a class called?

Accepted Answer

A)  Class midpoint 
B)  Class interval 
C)  Class array 
D)  Class frequency

Question 4

What is the following table called?

Accepted Answer

A)  Histogram 
B)  Frequency polygon 
C)  Cumulative frequency distribution 
D)  Frequency distribution

Question 5

Quinn's Café serves ice cream. She asks 100 of her regular customers to take a taste test and pick the flavour they like the best. The results are shown in the following table.  Is the data quantitative or qualitative? What is the name of the table shown?

Accepted Answer

A)  quantitative, simple table 
B)  quantitative, frequency table 
C)  qualitative, frequency table 
D)  qualitative, cumulative frequency distribution 
E)  quantitative, bar chart

Question 6

Refer to the following distribution of ages:  For the distribution of ages above, what is the relative class frequency for the lowest class?

Accepted Answer

A)  50% 
B)  18% 
C)  20% 
D)  10%

Question 7

Refer to the following distribution of ages:  What is the class interval?

Accepted Answer

A)  9 
B)  10 
C)  10.5 
D)  11

Question 8

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

Accepted Answer

A)  3% 
B)  6% 
C)  49% 
D)  94% 
E)  75%

Question 9

Consider the following relative frequency distribution:  If there are 2,000 numbers in the data set, how many of the values are less than 30?

Accepted Answer

A)  900 
B)  90 
C)  1900 
D)  100

Question 10

Consider the following stem and leaf plot:  Suppose that you decided to develop a frequency distribution from this plot.
What would be the lower limit of the first class?

Accepted Answer

A)  0 
B)  10 
C)  11 
D)  1 
E)  3

Question 11

(i. If you are constructing a stem-and-leaf display, the "20" in 20.5 would be the stem. (ii) An advantage of a stem-and-leaf chart over a histogram is that the identity of each observation is not lost, and that it presents a picture of the distribution.
(iii) If you are constructing a stem-and-leaf display, the "2" in 20.5 would be the leaf.

Accepted Answer

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

Question 12

The monthly incomes of a small sample of computer operators are $1,950, $1,775, $2,060, $1,840, $1,795, $1,890, $1,925 and $1,810. What are these ungrouped numbers called?

Accepted Answer

A)  Histogram 
B)  Class limits 
C)  Class frequencies 
D)  Raw data

Question 13

(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 mutually exclusive.
(iii) The best means to display data that is based on a trend over a period of time is the polygon.

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)  (ii) and (iii) are correct statements but not (i).

Question 14

In a simple Frequency Polygon, where is time plotted?

Accepted Answer

A)  On the X-axis 
B)  On the Y-axis 
C)  On either axis 
D)  Never plotted

Question 15

Given the following stem and leaf plot, determine the smallest value in the data set.

Accepted Answer

A)  1 
B)  19 
C)  199 
D)  45 
E)  2

Question 16

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%
D = 50%-54%
F = 0-49%
What is the most common letter grade earned?

Accepted Answer

A)  A (80%-89%) 
B)  B (70%-74%) 
C)  C (60%-64%) 
D)  D (50%-54%) 
E)  F (0-49%)

Question 17

The head of the statistics department wants to determine the number of mistake made by students in their first online assignment. She gathers information from her classes of the past year.  The approximate range (distance from the minimum value in the raw data up to the maximum value) of the data is _________.

Accepted Answer

A)  150 
B)  40 
C)  10 
D)  2

Question 18

When a class interval is expressed as: 100 to under 200

Accepted Answer

A)  Observations with values of 100 are excluded from the class frequency. 
B)  Observations with values of 200 are included in the class frequency. 
C)  Observations with values of 200 are excluded from the class frequency. 
D)  The class interval is 99.

Question 19

A group of 100 students were surveyed about their interest in a new International Studies program. The survey asked students about their interest in the program in terms of high, medium, or low. 30 students responded high interest; 50 students responded medium interest; 20 students responded low interest. What is the relative frequency of students with medium interest?

Accepted Answer

A)  30% 
B)  50% 
C)  20% 
D)  Cannot be determined.

Question 20

(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 mutually exclusive.
(iii) The suggested class interval based on number of observations given the data ranges from 100 to 200 with 50 observations is 20

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)  (ii) and (iii) are correct statements but not (i).

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

Refer to the following distribution of commissions: The first plot for a cumulative greater than frequency distribution should be:

In a frequency distribution, what is the number of observations in a class called?

What is the following table called?

Quinn's Café serves ice cream. She asks 100 of her regular customers to take a taste test and pick the flavour they like the best. The results are shown in the following table. Is the data quantitative or qualitative? What is the name of the table shown?

Refer to the following distribution of ages: For the distribution of ages above, what is the relative class frequency for the lowest class?

Refer to the following distribution of ages: What is the class interval?

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

Consider the following relative frequency distribution: If there are 2,000 numbers in the data set, how many of the values are less than 30?

Consider the following stem and leaf plot: Suppose that you decided to develop a frequency distribution from this plot. What would be the lower limit of the first class?

The monthly incomes of a small sample of computer operators are $1,950, $1,775, $2,060, $1,840, $1,795, $1,890, $1,925 and $1,810. What are these ungrouped numbers called?

In a simple Frequency Polygon, where is time plotted?

Given the following stem and leaf plot, determine the smallest value in the data set.

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% D = 50%-54% F = 0-49% What is the most common letter grade earned?

When a class interval is expressed as: 100 to under 200