Dependent T-Test Flashcards
what is a dependent t-test?
a parametric test that requires repeated measures data to compare two related conditions
what do dependent samples consist of?
a sample of matched pairs or testing the same group twice
dependent t-test output
descriptive statistics, t-value, degrees of freedom, and p-value
what does a dependent t-test write up require?
requires the degrees of freedom, t-value and p-value
how to get a one-tailed p-value
divide by p-value by two
example of dependent t-test write up
The results of the Dependent T-test showed that exercise had a significant effect on the number of pull-ups attained (t(24) = 5.196, p<0.001). participants could perform significantly more pull-ups after exercise (M = 4.2, SD = 1.29) than before exercise (M = 3.6, SD = 1.71).
what is effect size?
another way to quantify the difference between two groups by emphasising the size of difference
what does effect size promote?
an alternative to statistical significance
what does effect size measure?
the difference between two sample means
pearson r correlation
small effect size, r = 0.1
medium, r = 0.3
large, r = 0.5
when is cohen’s d correlation the appropriate measure?
when it is used in the context of a t-test on means
what is d defined as?
the difference between two means, divided by the pooled standard variation for those means
cohen’s d effect size
0.2 small effect
0.5 medium effect
0.8 large effect
what is a wilcoxon signed rank test?
non-parametric test used to compare two related samples, to assess whether their population mean ranks differ
what can wilcoxon be used as an alternative to?
the paired t-test when parametric assumptions are not met
