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Summary EPPP Questions Research and Statistics 2024
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EPPP Questions Research and Statistics 2024
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EPPP Questions Research and Statistics 2024R 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
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?
,EPPP Questions Research and Statistics 2024
a. randomized block design
b. a Solomon four-group design
c. counterbalancing
d. a double-blind study - d. a double blind study
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
,EPPP Questions Research and Statistics 2024
a. estimate the strength of a nonlinear relationship between two continuous
variables
b. estimate the strength of the relationship between two rank-ordered variables
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.
, EPPP Questions Research and Statistics 2024
Spearmena's rho - Used to measure the correlation between two sets of ranked
data
You have conducted a study to assess the relationship between salary and job
performance, and you find a significant correlation between these two variables.
You assistant tells you that the data fail to take into account a $25.00 cost of living
raise that every empoyee received. You should:
a. assume the correlation will not be affected
b. not be concerned since the added amount is too small to make a significant
difference
c. decide that the raise invalidated the research
d. reanalyze the data after the raises have been added to the current salaries. - a.
assume the correlation will not be affected
Note that you are adding a constant to each score in one of both data sets does
not change the relationship
A psychological researcher would like to determine what variables best distinguish
between patients who benefit from psychotherapy and patients who do not. To
identify these variables, the research would most likely use which of the
following?
a. canonical correlation
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