Question 1

Which of the following is NOT a rule for constructing a simple frequency distribution?

Accepted Answer

A)  The number of intervals should equal the number of values measured. 
B)  Each interval is equidistant. 
C)  No class interval overlaps. 
D)  At least five class intervals are included.

Question 2

Grouped data are used to summarize quantitative data that are continuous or discrete.

Accepted Answer

A) True 
 B)False

Question 3

Bar charts are a lot like histograms,except

Accepted Answer

A)  the bars displayed in the graph do not touch. 
B)  the bar chart summarizes quantitative data. 
C)  the bar chart summarizes continuous data. 
D)  all of these.

Question 4

What is the percentile point at the 50th percentile for the following distribution?

Accepted Answer

A)  21 
B)  23.5 
C)  25 
D)  25.5

Question 5

A frequency polygon is a dot-and-line graph where the dot is the upper class boundary of each interval and the line connects each dot.

Accepted Answer

A) True 
 B)False

Question 6

A researcher measures the weight (in ounces)of newborn infants in the month of March.What type of graphical display would be most appropriate for summarizing the frequency of infants falling into different intervals of weight?

Accepted Answer

A)  histogram 
B)  bar chart 
C)  scatter gram 
D)  all of these

Question 7

A circular graph that displays the relative percentage of a frequency distribution into sectors is called a scatter gram.

Accepted Answer

A) True 
 B)False

Question 8

A simple frequency distribution

Accepted Answer

A)  can be used to summarize grouped data. 
B)  can be used to summarize ungrouped data. 
C)  summarizes the frequency of scores in a given category or range. 
D)  all of these

Question 9

Ungrouped data are always distributed in intervals.

Accepted Answer

A) True 
 B)False

Question 10

A researcher finds that 12% of participants make between three and five visits to a physician each year.What are the real limits for this interval?

Accepted Answer

A)  3-5 
B)  2.5-5.5 
C)  2.5-3.5 
D)  equal to the sum of the products for the previous interval

Question 11

A cumulative frequency distribution is the sum of frequencies across a series of intervals.

Accepted Answer

A) True 
 B)False

Question 12

A stem-and-leaf display retains the value of each data point.

Accepted Answer

A) True 
 B)False

Question 13

The following is a simple frequency distribution table.If we convert this frequency distribution to relative percentages,which of the following gives the corresponding relative percentages in each interval?

Accepted Answer

A)  20%, 33%, 50%, 67%, and 100% 
B)  0.2, 0.13, 0.17, 0.33, and 0.17 
C)  20%, 13%, 17%, 33%, and 17% 
D)  6, 10, 15, 25, and 30

Question 14

Whether you cumulate a frequency distribution from the bottom up or the top down depends on how you want to discuss the data.

Accepted Answer

A) True 
 B)False

Question 15

The ______ is the percentage of scores with values that fall below a specified score in a distribution.

Accepted Answer

A)  percentile rank 
B)  interval 
C)  relative frequency 
D)  percentile point

Question 16

A researcher distributes frequencies into the following intervals: 1-10,11-20,21-30,31-40,41-50,and 51 and above.What is wrong with this frequency distribution?

Accepted Answer

A)  The interval width is too small. 
B)  The interval width is unequal. 
C)  The class intervals overlap. 
D)  One interval is an open class.

Question 17

A researcher wants to determine how many participants will take less than 24 s to complete a cognitive performance task.If he constructs a frequency distribution for these data,what type of distribution would be most appropriate to answer his question?

Accepted Answer

A)  a simple frequency distribution 
B)  a relative frequency distribution 
C)  a cumulative frequency distribution from the bottom up 
D)  a cumulative frequency distribution from the top down

Question 18

A percentile is also called a:

Accepted Answer

A)  score. 
B)  range. 
C)  distribution. 
D)  percentile point.

Question 19

State the problem with this simple frequency distribution.

Accepted Answer

A)  The interval width is too small. 
B)  The interval width is unequal. 
C)  The class intervals overlap. 
D)  The number of intervals is too small.

Question 20

A researcher distributes frequencies into the following intervals: 3-6,7-10,11-15,16-18,19-22,and 23-26.What is wrong with this frequency distribution?

Accepted Answer

A)  The interval width is too small. 
B)  The interval width is unequal. 
C)  The first class interval does not begin at 0. 
D)  One interval is an open class.

Exam 2: Summarizing Data: Frequency Distributions in Tables and Graphs

Which of the following is NOT a rule for constructing a simple frequency distribution?

Grouped data are used to summarize quantitative data that are continuous or discrete.

Bar charts are a lot like histograms,except

What is the percentile point at the 50th percentile for the following distribution?

A frequency polygon is a dot-and-line graph where the dot is the upper class boundary of each interval and the line connects each dot.

A researcher measures the weight (in ounces) of newborn infants in the month of March.What type of graphical display would be most appropriate for summarizing the frequency of infants falling into different intervals of weight?

A circular graph that displays the relative percentage of a frequency distribution into sectors is called a scatter gram.

A simple frequency distribution

Ungrouped data are always distributed in intervals.

A researcher finds that 12% of participants make between three and five visits to a physician each year.What are the real limits for this interval?

A cumulative frequency distribution is the sum of frequencies across a series of intervals.

A stem-and-leaf display retains the value of each data point.

The following is a simple frequency distribution table.If we convert this frequency distribution to relative percentages,which of the following gives the corresponding relative percentages in each interval?

Whether you cumulate a frequency distribution from the bottom up or the top down depends on how you want to discuss the data.

The ______ is the percentage of scores with values that fall below a specified score in a distribution.

A researcher distributes frequencies into the following intervals: 1-10,11-20,21-30,31-40,41-50,and 51 and above.What is wrong with this frequency distribution?

A researcher wants to determine how many participants will take less than 24 s to complete a cognitive performance task.If he constructs a frequency distribution for these data,what type of distribution would be most appropriate to answer his question?

A percentile is also called a:

State the problem with this simple frequency distribution.

A researcher distributes frequencies into the following intervals: 3-6,7-10,11-15,16-18,19-22,and 23-26.What is wrong with this frequency distribution?