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...
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
The benefits of buying summaries with Stuvia:
Guaranteed quality through customer reviews
Stuvia customers have reviewed more than 700,000 summaries. This how you know that you are buying the best documents.
Quick and easy check-out
You can quickly pay through credit card or Stuvia-credit for the summaries. There is no membership needed.
Focus on what matters
Your fellow students write the study notes themselves, which is why the documents are always reliable and up-to-date. This ensures you quickly get to the core!
Frequently asked questions
What do I get when I buy this document?
You get a PDF, available immediately after your purchase. The purchased document is accessible anytime, anywhere and indefinitely through your profile.
Satisfaction guarantee: how does it work?
Our satisfaction guarantee ensures that you always find a study document that suits you well. You fill out a form, and our customer service team takes care of the rest.
Who am I buying these notes from?
Stuvia is a marketplace, so you are not buying this document from us, but from seller CertifiedGrades. Stuvia facilitates payment to the seller.
Will I be stuck with a subscription?
No, you only buy these notes for $9.89. You're not tied to anything after your purchase.
