Parametric Tests of Difference: Unrelated & Related T-tests (AQA A-Level Psychology): Quizzes
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Practise the questions
10 questions from this quiz
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Practise the questions
10 questions from this quiz
Which THREE criteria must be met to use parametric tests?
Which THREE criteria must be met to use parametric tests?
Interval data, homogeneity, normal dist.
Why are parametric tests preferred over non-parametric tests?
Why are parametric tests preferred over non-parametric tests?
They are more powerful & detect effects
Which tests are non-parametric alternatives to t-tests?
Which tests are non-parametric alternatives to t-tests?
Mann-Whitney U & Wilcoxon
What determines whether to use an unrelated or related t-test?
What determines whether to use an unrelated or related t-test?
The experimental design used
When should an unrelated t-test be used?
When should an unrelated t-test be used?
With independent measures design
When should a related t-test be used?
When should a related t-test be used?
When same participants tested twice
What is the degrees of freedom formula for an unrelated t-test?
What is the degrees of freedom formula for an unrelated t-test?
N₁ + N₂ - 2
What is the degrees of freedom formula for a related t-test?
What is the degrees of freedom formula for a related t-test?
N - 1
When is a result statistically significant?
When is a result statistically significant?
When calculated value > critical value
Why is the related t-test more sensitive than the unrelated t-test?
Why is the related t-test more sensitive than the unrelated t-test?
It controls for individual differences