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Paired t-test AKA t-test for related scores
Terms in this set (12)
What does a t-test do?
Compare the means of two different sets of scores to see whether they are significantly different
When do we used a related t-test?
1. When our study uses a repeated experimental design
2. When the study uses a matched pairs design
Name the two possible sources of variance within a sample
1. The difference between the two means= TRUE VARIANCE
2. Uncontrolled factors= ERROR VARIANCE
How many IVs can a t-test use?
How many DVs can a t-test use?
When comparing to the table of significant values, how do we know whether our value is significant?
If it is greater than the critical value
How do we carry out a t-test with two samples?
We convert the means from our two groups into a single value by subtracting one from the other to give us our D score
Why do we not use the D score when carrying out a t-test?
The null hypothesis assumes that there will be a population difference of 0, so we would just be subtracting 0
What is the corresponding non-parametric test for a paired t-test?
Wilcoxon matched pairs
How do we find our result for a Wilcoxon matched pairs test?
We sum the positive and the negative ranks together separately, and see which one is lowest. We take the lowest value as our final score
How do we know whether our Wilcoxon matched pairs value is significant?
It must be equal to or less than the value in the significance table
When using Wilcoxon matched pairs, which symbol do we use?
T for a small sample
z for a sample greater than 10
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