NPE Research Methods and Statistics 2

Question 1

Which of the following correlation coefficients reflects the strongest linear relationship between two variables?

Accepted Answer

-0.78

Answer

The strength of a correlation is determined by its absolute value; -0.78 has the highest absolute value (0.78) among the options.

Question 2

A researcher rejects the null hypothesis when it is actually true. This is an example of:

Accepted Answer

Type I error

Answer

A Type I error (false positive) occurs when the null hypothesis is incorrectly rejected; its probability equals the alpha level.

Question 3

Cohen's d is a commonly reported statistic in psychological research. What does it primarily measure?

Accepted Answer

The practical significance or magnitude of a treatment effect

Answer

Cohen's d is an effect size statistic that quantifies the practical magnitude of a difference between means, independent of sample size.

Question 4

A researcher follows the same cohort of children from age 5 to age 18 to study cognitive development. This is best described as a:

Accepted Answer

Longitudinal design

Answer

A longitudinal design tracks the same participants across extended time periods, allowing researchers to observe developmental changes within individuals.

Question 5

Which measure of central tendency is most resistant to the influence of extreme outliers in a distribution?

Accepted Answer

Median

Answer

The median is the middle value and is not affected by extreme scores, making it a more robust measure when outliers are present.

NPE - National Psychology Exam Practice Test

NPE - National Psychology Exam Practice Test

NPE Research Methods and Statistics 2