EPPP Questions Research and
Statistics Exam Questions and Answers
100% Pass
R squared is the:
a. coefficient of multiple determination
b. coefficient of stability
c. coefficient of internal consistency
d. silver character on "Star Wars" - ✔✔a. coefficient of multiple
determination
When data points are widely scattered around a regression line, this
indicates:
a. low homoscedasticity
1
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,b. low correlation coefficient
c. low heteroscedasticity
d. high heteroscedasticity - ✔✔b. low correlation coefficient
Heteroscedasticity - ✔✔The scatter is uneven (unequal) at different points
on the regression line. For example, there might be high variability around
the regression line at low X (predictor) values and low variability around
the line at high X values. It is different amounts of scatter, but not high
scatter
A psychologist in a hospital is conducting research designed to assess the
effects of a new drug on the social behavior of psychotic patients. Which of
the following would be the best way to decrease experimenter bias in this
type of study?
a. randomized block design
b. a Solomon four-group design
c. counterbalancing
d. a double-blind study - ✔✔d. a double blind study
2
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,Which of the following is a measure of "amount of variability accounted
for"?
a. Cohen's d
b. F-ratio
c. alpha
d. eta squared - ✔✔d. eta squared
Alpha - ✔✔Level of significance set by a researcher prior to analyzing data
Cohen's d - ✔✔Used as an index of effect size, but it is a measure of the
mean difference between two groups.
F-ratio - ✔✔Statistic calculated when using the analysis of variance
The eta coefficient would be used to
a. estimate the strength of a nonlinear relationship between two continuous
variables
b. estimate the strength of the relationship between two rank-ordered
variables
3
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, c. estimate the strength of the relationship between two dichotomous
variables
d. estimate the strength of the relationship between a dichotomous variable
and a continuous variable - ✔✔a. estimate the strength of a nonlinear
relationship between two continuous variables.
The most common correlation coefficient - ✔✔Pearson r
Pearson r - ✔✔Used to measure the relationship between two continuous
variables that are related in a linear way
Note: eta is used when there is a nonlinear relationship
Phi Coefficient - ✔✔Can be used to measure the correlation between two
dichotomous variables (i.e, variables that can take one of two values)
Point-Bisceral Correlation - ✔✔Used to measure the correlation between a
dichotomous variable and a continuous variable.
Spearmena's rho - ✔✔Used to measure the correlation between two sets of
ranked data
4
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Statistics Exam Questions and Answers
100% Pass
R squared is the:
a. coefficient of multiple determination
b. coefficient of stability
c. coefficient of internal consistency
d. silver character on "Star Wars" - ✔✔a. coefficient of multiple
determination
When data points are widely scattered around a regression line, this
indicates:
a. low homoscedasticity
1
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,b. low correlation coefficient
c. low heteroscedasticity
d. high heteroscedasticity - ✔✔b. low correlation coefficient
Heteroscedasticity - ✔✔The scatter is uneven (unequal) at different points
on the regression line. For example, there might be high variability around
the regression line at low X (predictor) values and low variability around
the line at high X values. It is different amounts of scatter, but not high
scatter
A psychologist in a hospital is conducting research designed to assess the
effects of a new drug on the social behavior of psychotic patients. Which of
the following would be the best way to decrease experimenter bias in this
type of study?
a. randomized block design
b. a Solomon four-group design
c. counterbalancing
d. a double-blind study - ✔✔d. a double blind study
2
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,Which of the following is a measure of "amount of variability accounted
for"?
a. Cohen's d
b. F-ratio
c. alpha
d. eta squared - ✔✔d. eta squared
Alpha - ✔✔Level of significance set by a researcher prior to analyzing data
Cohen's d - ✔✔Used as an index of effect size, but it is a measure of the
mean difference between two groups.
F-ratio - ✔✔Statistic calculated when using the analysis of variance
The eta coefficient would be used to
a. estimate the strength of a nonlinear relationship between two continuous
variables
b. estimate the strength of the relationship between two rank-ordered
variables
3
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, c. estimate the strength of the relationship between two dichotomous
variables
d. estimate the strength of the relationship between a dichotomous variable
and a continuous variable - ✔✔a. estimate the strength of a nonlinear
relationship between two continuous variables.
The most common correlation coefficient - ✔✔Pearson r
Pearson r - ✔✔Used to measure the relationship between two continuous
variables that are related in a linear way
Note: eta is used when there is a nonlinear relationship
Phi Coefficient - ✔✔Can be used to measure the correlation between two
dichotomous variables (i.e, variables that can take one of two values)
Point-Bisceral Correlation - ✔✔Used to measure the correlation between a
dichotomous variable and a continuous variable.
Spearmena's rho - ✔✔Used to measure the correlation between two sets of
ranked data
4
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