EPPP Questions Research and Statistics With Correct Answers

EPPP Questions Research and Statistics
With Correct Answers


R squared is the:
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a. coefficient of multiple determination
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b. coefficient of stability
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c. coefficient of internal consistency
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d. silver character on "Star Wars" - CORRECT ANSWER✔✔-a. coefficient
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of multiple determination
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When data points are widely scattered around a regression line, this
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indicates:
a. low homoscedasticity
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b. low correlation coefficient
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c. low heteroscedasticity
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d. high heteroscedasticity - CORRECT ANSWER✔✔-b. low correlation
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coefficient


Heteroscedasticity - CORRECT ANSWER✔✔-The scatter is uneven
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(unequal) at different points on the regression line. For example, there
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might be high variability around the regression line at low X (predictor)
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,values and low variability around the line at high X values. It is different
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amounts of scatter, but not high scatter| | | | | |




A psychologist in a hospital is conducting research designed to assess
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the effects of a new drug on the social behavior of psychotic patients.
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Which of the following would be the best way to decrease experimenter
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bias in this type of study?
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a. randomized block design
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b. a Solomon four-group design
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c. counterbalancing
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d. a double-blind study - CORRECT ANSWER✔✔-d. a double blind study
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Which of the following is a measure of "amount of variability accounted
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for"?
a. Cohen's d
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b. F-ratio
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c. alpha
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d. eta squared - CORRECT ANSWER✔✔-d. eta squared
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Alpha - CORRECT ANSWER✔✔-Level of significance set by a researcher
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prior to analyzing data
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,Cohen's d - CORRECT ANSWER✔✔-Used as an index of effect size, but it
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is a measure of the mean difference between two groups.
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F-ratio - CORRECT ANSWER✔✔-Statistic calculated when using the
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analysis of variance | |




The eta coefficient would be used to
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a. estimate the strength of a nonlinear relationship between two
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continuous variables |




b. estimate the strength of the relationship between two rank-ordered
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variables
c. estimate the strength of the relationship between two dichotomous
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variables
d. estimate the strength of the relationship between a dichotomous
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variable and a continuous variable - CORRECT ANSWER✔✔-a. estimate
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the strength of a nonlinear relationship between two continuous
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variables.


The most common correlation coefficient - CORRECT ANSWER✔✔-
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Pearson r |




Pearson r - CORRECT ANSWER✔✔-Used to measure the relationship
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between two continuous variables that are related in a linear way
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Note: eta is used when there is a nonlinear relationship
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, Phi Coefficient - CORRECT ANSWER✔✔-Can be used to measure the
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correlation between two dichotomous variables (i.e, variables that can
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take one of two values)
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Point-Bisceral Correlation - CORRECT ANSWER✔✔-Used to measure the
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correlation between a dichotomous variable and a continuous variable.
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Spearmena's rho - CORRECT ANSWER✔✔-Used to measure the
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correlation between two sets of ranked data
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You have conducted a study to assess the relationship between salary
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and job performance, and you find a significant correlation between
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these two variables. You assistant tells you that the data fail to take into
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account a $25.00 cost of living raise that every empoyee received. You
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should:
a. assume the correlation will not be affected
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b. not be concerned since the added amount is too small to make a
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significant difference |




c. decide that the raise invalidated the research
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d. reanalyze the data after the raises have been added to the current
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salaries. - CORRECT ANSWER✔✔-a. assume the correlation will not be
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affected |