Question 1

A student scores in the 80th percentile on an exam.What does this mean in comparison to all other students?

Accepted Answer

A)  the student scored higher than 80% of all others who took the exam
B)  the student scored worse than 80% of all others who took the exam
C)  Of all those who took the exam,only 80% of them completed it
D)  the student would score the same grade on the exam 80% of the time A

Question 2

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. D

Question 3

As a general rule,a simple frequency distribution should have between

Accepted Answer

A)  3 and 6 intervals
B)  5 and 10 intervals
C)  8 and 12 intervals
D)  5 and 20 intervals

Question 4

When cumulating frequencies from the bottom up,the data are discussed in terms of

Accepted Answer

A)  at most
B)  less than
C)  at or below
D)  all of the above

Question 5

A researcher records the number of children at a local school from single-,divorced-,and married-parent homes.This frequency data would be best displayed as a

Accepted Answer

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

Question 6

The ________ is the percentage of scores with values that fall below a specified score in a distribution,is called the:

Accepted Answer

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

Question 7

A relative frequency is typically used with smaller,but not larger,data sets.

Accepted Answer

A) True 
 B)False

Question 8

A researcher distributes frequencies into the following classes: absent,tardy,present.What type of data are distributed?

Accepted Answer

A)  nominal data
B)  qualitative data
C)  ungrouped data
D)  all of the above

Question 9

A percentile point is

Accepted Answer

A)  the value of a score on a measurement scale below which a specified percentage of scores in a distribution fall
B)  a summary display that distributes the sum of percentages across a series of intervals
C)  an interval with no defined upper or lower boundary
D)  the range of values contained in each interval of a grouped frequency distribution

Question 10

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 11

A histogram is basically a bar chart where the bars do not touch.

Accepted Answer

A) True 
 B)False

Question 12

The sum of relative frequencies for each interval is _____.

Accepted Answer

A)  1.00
B)  100%
C)  equal to the total number of scores in a distribution
D)  both A and B

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 percentages in each interval listed from the top down.

Accepted Answer

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

Question 14

The following is a simple frequency distribution table.Suppose we convert this table to a cumulative frequency distribution.The frequencies in each interval of the cumulative frequency distribution would be

Accepted Answer

A)  5,8,10,14,20 (top down summary) 
B)  6,10,12,15,20 (bottom up summary) 
C)  both A and B,depending on how the data were summarized
D)  It is not possible to summarize the data using a cumulative frequency distribution. C

Question 15

A researcher measures the time (in seconds) that it takes children to complete a basic reading skills task.What type of graphical display would be most appropriate for summarizing the frequency of children falling into different intervals of time?

Accepted Answer

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

Question 16

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 17

A researcher finds that 12% of participants make between 3-5 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 18

A researcher reports that 12 persons in a sample of 60 reported getting between 4 and 6 hours of sleep per night.What is the relative percentage for this interval?

Accepted Answer

A)  24%
B)  22%
C)  20%
D)  There is not enough information to answer this question.

Question 19

Grouped data are to ungrouped data as

Accepted Answer

A)  quantitative is to qualitative
B)  qualitative is to quantitative
C)  inferential is to descriptive
D)  descriptive is to inferential

Question 20

State the type of graphical display for Graph A and Graph B.

Accepted Answer

A)  A is a bar chart;B is a histogram.
B)  B is a bar chart;A is a histogram.
C)  Both graphs are bar charts.
D)  Both graphs are histograms.

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

A student scores in the 80th percentile on an exam.What does this mean in comparison to all other students?

Correct AnswerverifiedA

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?

Correct AnswerverifiedD

As a general rule,a simple frequency distribution should have between

Correct AnswerverifiedShow Answer

When cumulating frequencies from the bottom up,the data are discussed in terms of

Correct AnswerverifiedShow Answer

A researcher records the number of children at a local school from single-,divorced-,and married-parent homes.This frequency data would be best displayed as a

Correct AnswerverifiedShow Answer

The ________ is the percentage of scores with values that fall below a specified score in a distribution,is called the:

Correct AnswerverifiedShow Answer

A relative frequency is typically used with smaller,but not larger,data sets.

Correct AnswerverifiedShow Answer

A researcher distributes frequencies into the following classes: absent,tardy,present.What type of data are distributed?

Correct AnswerverifiedShow Answer

A percentile point is

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

A histogram is basically a bar chart where the bars do not touch.

Correct AnswerverifiedShow Answer

The sum of relative frequencies for each interval is _____.

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

The following is a simple frequency distribution table.Suppose we convert this table to a cumulative frequency distribution.The frequencies in each interval of the cumulative frequency distribution would be

Correct AnswerverifiedC

A researcher measures the time (in seconds) that it takes children to complete a basic reading skills task.What type of graphical display would be most appropriate for summarizing the frequency of children falling into different intervals of time?

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

A researcher finds that 12% of participants make between 3-5 visits to a physician each year.What are the real limits for this interval?

Correct AnswerverifiedShow Answer

A researcher reports that 12 persons in a sample of 60 reported getting between 4 and 6 hours of sleep per night.What is the relative percentage for this interval?

Correct AnswerverifiedShow Answer

Grouped data are to ungrouped data as

Correct AnswerverifiedShow Answer

State the type of graphical display for Graph A and Graph B.

Correct AnswerverifiedShow Answer

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D

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C

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