DA0-001 · Question #220
DA0-001 Question #220: Real Exam Question with Answer & Explanation
The correct answer is C: Dependent t-test. To measure changes in a single group or set of subjects over two different time points, a dependent t-test is the appropriate statistical method. This test is specifically designed for within-subjects designs, comparing means from the same group under different conditions or time
Question
Which of the following statistical methods can be used to measure changes over time?
Options
- ACorrelation test
- BIndependent chi-squared test
- CDependent t-test
- DZ-test
Explanation
To measure changes in a single group or set of subjects over two different time points, a dependent t-test is the appropriate statistical method. This test is specifically designed for within-subjects designs, comparing means from the same group under different conditions or times.
Common mistakes.
- A. A correlation test measures the strength and direction of a linear relationship between two variables, but it does not specifically measure changes over time.
- B. An independent chi-squared test is used to determine if there is a significant association between two categorical variables from independent samples, not for measuring changes over time in a continuous variable.
- D. A Z-test is typically used to compare a sample mean to a population mean when the population standard deviation is known, or to compare two sample means with known population standard deviations, not specifically for measuring changes over time in the same group.
Concept tested. Statistical hypothesis testing - measuring change over time
Reference. https://www.ibm.com/docs/en/spss-statistics/29.0.0?topic=tests-paired-samples-t-test
Topics
Community Discussion
No community discussion yet for this question.