Parametric tests Flashcards

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1
Q

What are parametric tests?

A

Tests that have certain rules, or parameters, about when they can be used

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2
Q

What are the good things about parametric tests?

A

They’re more powerful and robust than other tests
They are more sensitive to the features of the data collected and may detect significance within some data sets that non-parametric tests cannot

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3
Q

What are the parametric tests?

A

Unrelated T-test, related T-test and Pearsons r

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4
Q

What are the 3 criteria for a parametric test?

A
  • Data must be interval level
  • The data should be drawn from a population which would be expected to show a normal distribution for the variable being measured
  • There should be homogeneity of variance
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5
Q

How can we check for a normal distribution of a variable in a population?

A

If the mean, median and mode values are similar

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6
Q

What is homogeneity of variance?

A

Sets of scores in each condition should have a similar dispersion or spread

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7
Q

How can we determine homogeneity of variance?

A

Comparing the standard deviation in each condition; if they’re similar a parametric test may be used
OR carrying out an F-test

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8
Q

What is an F-test?

A

It tests for a difference in variance between the two sets of data

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