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EPPP Questions Research and Statistics Graded A+
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EPPP Questions Research and Statistics Graded A+ R squared is known as: Answer Choices: - a. coefficient of multiple determination - b. coefficient of stability - c. coefficient of internal consistency - d. silver character on "Star Wars" Correct Answer: a. coefficient of multiple determinati...

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  • August 15, 2024
  • 44
  • 2024/2025
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EPPP Questions Research and Statistics Graded A+
R squared is known as:



Answer Choices:

- a. coefficient of multiple determination

- b. coefficient of stability

- c. coefficient of internal consistency

- d. silver character on "Star Wars"



Correct Answer: a. coefficient of multiple determination



---



When data points are widely scattered around a regression line, it indicates:



Answer Choices:

- a. low homoscedasticity

- b. low correlation coefficient

- c. low heteroscedasticity

- d. high heteroscedasticity



Correct Answer: b. low correlation coefficient

Rationale: The uneven scatter around the regression line signifies a weak linear relationship.



---



Heteroscedasticity refers to:

,Correct Answer: The scatter is uneven (unequal) at different points on the regression line. Variability
may differ across the range of the predictor variable, indicating inconsistency in the relationships at
various levels.



---



In a study evaluating the effects of a new drug on psychotic patients' social behavior, the best method to
reduce experimenter bias is:



Answer Choices:

- a. randomized block design

- b. a Solomon four-group design

- c. counterbalancing

- d. a double-blind study



Correct Answer: d. a double-blind study

Rationale: This design ensures that neither participants nor experimenters know who receives the
treatment, minimizing bias.



---



Which measure indicates the "amount of variability accounted for"?



Answer Choices:

- a. Cohen's d

- b. F-ratio

- c. alpha

- d. eta squared



Correct Answer: d. eta squared

,Rationale: Eta squared quantifies the proportion of variance explained by an independent variable in
relation to a dependent variable.



---



The eta coefficient would be used to:



Answer Choices:

- 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



Correct Answer: a. estimate the strength of a nonlinear relationship between two continuous variables.



---



The most common correlation coefficient is:



Correct Answer: Pearson r

Rationale: Pearson's r is utilized to assess linear relationships between two continuous variables.



Note: Eta is used for nonlinear relationships.



---



Phi Coefficient is used to measure:

, Rationale: It quantifies the correlation between two dichotomous variables, while Point-Biserial
Correlation measures the relationship between a dichotomous variable and a continuous variable, and
Spearman's rho is employed for ranked data correlation.



---



You have found a significant correlation between salary and job performance. If you are informed about
a $25.00 cost of living raise that every employee received, you should:



Answer Choices:

- 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.



Correct Answer: a. assume the correlation will not be affected

Rationale: Adding a constant to each score does not alter the correlation between the variables.



---



A psychological researcher aiming to distinguish variables that separate patients who benefit from
psychotherapy from those who do not would likely use:



Answer Choices:

- a. canonical correlation

- b. factor analysis

- c. MANOVA

- d. discriminant function analysis



Correct Answer: d. discriminant function analysis

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