DA0-001 · Question #220
Which of the following statistical methods can be used to measure changes over time?
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…
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
How the community answered
(56 responses)- A4% (2)
- B2% (1)
- C88% (49)
- D7% (4)
Why each option
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.
A correlation test measures the strength and direction of a linear relationship between two variables, but it does not specifically measure changes over time.
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.
A dependent t-test, also known as a paired-samples t-test, is used to compare the means of two related groups or measurements from the same group at two different points in time. This makes it suitable for analyzing changes in a variable over time within the same subjects or entities.
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
Source: https://www.ibm.com/docs/en/spss-statistics/29.0.0?topic=tests-paired-samples-t-test
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