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The Concept of Probability & Levels of significance:
Levels of Significance:
Before an investigation psychologists must decide what level of probability they are prepared
to accept that a set of results occurred by chance.
In psychology usually settle for being 95% sure that results are not due to chance or…

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The more stringent the level of significance (e.g 1% level) the more likely it is we make a
type 2 error.
The more lenient the level (e.g 10%) the more chance of a type 1 error.
5% is often seen as offering the best balance.

Positive, negative and zero correlation:…

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