Question 1

What is commonly known as the "average is more correctly called the:

Accepted Answer

A)  median 
B)  arithmetic mean 
C)  geometric mean 
D)  mode 
A)  median 
B)  arithmetic mean 
C)  geometric mean 
D)  mode B

Question 2

A strong correlation between two variables implies causation.

Accepted Answer

A) True 
 B)False  False

Question 3

In a negatively skewed polygon, the tail of the distribution trails off to the left, in the direction of the lower scores.

Accepted Answer

A) True 
 B)False  True

Question 4

In a crossbreak table, expected frequency is:

Accepted Answer

A)  the actual frequency in each cell 
B)  the value that is anticipated in each cell 
C)  the frequency in the margin of the dependent variable 
D)  none of the above 
A)  the actual frequency in each cell 
B)  the value that is anticipated in each cell 
C)  the frequency in the margin of the dependent variable 
D)  none of the above

Question 5

The primary value of frequency polygons is that they:

Accepted Answer

A)  are easy to construct 
B)  contain all the information in the original scores 
C)  are easy to interpret 
D)  can be used with categorical data 
A)  are easy to construct 
B)  contain all the information in the original scores 
C)  are easy to interpret 
D)  can be used with categorical data

Question 6

The standard deviation is calculated by 95% of all the scores in a distribution.

Accepted Answer

A) True 
 B)False

Question 7

The median is equal to:

Accepted Answer

A)  the mean 
B)  the mode 
C)  the 25th percentile 
D)  the 50th percentile 
A)  the mean 
B)  the mode 
C)  the 25th percentile 
D)  the 50th percentile

Question 8

Calculation of the Pearson Product-Moment Correlation Coefficient:

Accepted Answer

A)  requires only the ability to add, subtract, multiply, and divide 
B)  requires the ability to add, subtract, multiply, divide, and take a square root 
C)  requires the ability to solve algebraic equations 
D)  requires the ability to perform simple calculus operations 
A)  requires only the ability to add, subtract, multiply, and divide 
B)  requires the ability to add, subtract, multiply, divide, and take a square root 
C)  requires the ability to solve algebraic equations 
D)  requires the ability to perform simple calculus operations

Question 9

Which of the following sets of scores has the largest standard deviation?

Accepted Answer

A)  312,312,312,312,312 
B)  44,45,46,46 
C)  530,531,532,533,533 
D)  6,11,38,55,68 
A)  312,312,312,312,312 
B)  44,45,46,46 
C)  530,531,532,533,533 
D)  6,11,38,55,68

Question 10

The contingency coefficient:

Accepted Answer

A)  is analogous to the correlation coefficient 
B)  is used only with crossbreak tables 
C)  can be less than 1.00 
D)  is all of the above 
A)  is analogous to the correlation coefficient 
B)  is used only with crossbreak tables 
C)  can be less than 1.00 
D)  is all of the above

Question 11

When scores are grouped in constructing a frequency polygon or scatterplot:

Accepted Answer

A)  all intervals must be the same size 
B)  individual scores (within intervals) are plotted 
C)  there should be at least 30 intervals 
D)  each interval should contain 5-10 scores 
A)  all intervals must be the same size 
B)  individual scores (within intervals) are plotted 
C)  there should be at least 30 intervals 
D)  each interval should contain 5-10 scores

Question 12

Eta should be used when:

Accepted Answer

A)  one variable is categorical 
B)  there are extreme scores on one (or both) variables 
C)  the relationship between variables is best described by a straight line 
D)  the relationship between variables is best described by a curve 
A)  one variable is categorical 
B)  there are extreme scores on one (or both) variables 
C)  the relationship between variables is best described by a straight line 
D)  the relationship between variables is best described by a curve

Question 13

The maximum possible correspondence or correlation between two variables is represented by a Pearson
Product-moment coefficient of:

Accepted Answer

A)  -1.00 
B)  .00 
C)  .90 
D)  200 
A)  -1.00 
B)  .00 
C)  .90 
D)  200

Question 14

Matching
-Parameters

Accepted Answer

A)  Sample 
B)  Population 
C)  Interest in math 
D)  Teaching methods 
A)  Sample 
B)  Population 
C)  Interest in math 
D)  Teaching methods

Question 15

A test was given to two sections of a course. The results were:
Section I:
Mean: 51; Standard Deviation: 7
Section II:
Mean: 51; Standard deviation: 13
Which of the following conclusions is correct?

Accepted Answer

A)  Section I did better on the test than Section II. 
B)  Section I is more homogeneous than Section II. 
C)  Section I has more bright students than Section II. 
D)  The students in Section I performed less consistently than those in Section II. 
A)  Section I did better on the test than Section II. 
B)  Section I is more homogeneous than Section II. 
C)  Section I has more bright students than Section II. 
D)  The students in Section I performed less consistently than those in Section II.

Question 16

The standard deviation tells how:

Accepted Answer

A)  much the scores in a distribution are spread out 
B)  one group compares in level of performance to another 
C)  highly one variable is related to another 
D)  an individual compares to a group 
A)  much the scores in a distribution are spread out 
B)  one group compares in level of performance to another 
C)  highly one variable is related to another 
D)  an individual compares to a group

Question 17

A scatterplot can be used only when:

Accepted Answer

A)  both variables are quantitative 
B)  both variables are categorical 
C)  one variable is categorical; the other is quantitative 
D)  any of the above 
A)  both variables are quantitative 
B)  both variables are categorical 
C)  one variable is categorical; the other is quantitative 
D)  any of the above

Question 18

An advantage of z-scores is that:

Accepted Answer

A)  persons will score higher on a z-score than on other scores 
B)  they are easier to obtain than percentile ranks 
C)  they have higher reliability than other types of scores 
D)  scores on different instruments can be compared 
A)  persons will score higher on a z-score than on other scores 
B)  they are easier to obtain than percentile ranks 
C)  they have higher reliability than other types of scores 
D)  scores on different instruments can be compared

Question 19

A z-score is obtained by:

Accepted Answer

A)  dividing the score by the standard deviation and subtracting from the mean 
B)  adding the score to the standard deviation and dividing by the mean 
C)  dividing the score by the mean and subtracting from the standard deviation 
D)  subtracting the mean from the score and dividing by the standard deviation 
A)  dividing the score by the standard deviation and subtracting from the mean 
B)  adding the score to the standard deviation and dividing by the mean 
C)  dividing the score by the mean and subtracting from the standard deviation 
D)  subtracting the mean from the score and dividing by the standard deviation

Question 20

Matching
-Quantitative data

Accepted Answer

A)  Sample 
B)  Population 
C)  Interest in math 
D)  Teaching methods 
A)  Sample 
B)  Population 
C)  Interest in math 
D)  Teaching methods

Exam 10: Descriptive Statistics

What is commonly known as the "average is more correctly called the:

A strong correlation between two variables implies causation.

In a negatively skewed polygon, the tail of the distribution trails off to the left, in the direction of the lower scores.

In a crossbreak table, expected frequency is:

The primary value of frequency polygons is that they:

The standard deviation is calculated by 95% of all the scores in a distribution.

The median is equal to:

Calculation of the Pearson Product-Moment Correlation Coefficient:

Which of the following sets of scores has the largest standard deviation?

The contingency coefficient:

When scores are grouped in constructing a frequency polygon or scatterplot:

Eta should be used when:

The maximum possible correspondence or correlation between two variables is represented by a Pearson Product-moment coefficient of:

Matching -Parameters

A test was given to two sections of a course. The results were: Section I: Mean: 51; Standard Deviation: 7 Section II: Mean: 51; Standard deviation: 13 Which of the following conclusions is correct?

The standard deviation tells how:

A scatterplot can be used only when:

An advantage of z-scores is that:

A z-score is obtained by:

Matching -Quantitative data

The Nature of Research

The Research Problem

Locating and Reviewing the Literature

Ethics and Research

Variables and Hypotheses

Sampling

Instrumentation

Validity and Reliability

Internal Validity

Inferential Statistics

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Correlational Research

Causal-Comparative Research

Survey Research

The Nature of Qualitative Research

Observation and Interviewing

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