Types of errors

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Psychology unit 4 research methods
Types of errors
Type 1 error- when we say there is a significant difference or correlation when in
fact there isn't. This also means we have accepted the alternate hypothesis
incorrectly. Therefore we have rejected the null hypothesis incorrectly.
Type 2 error- when we say there isn't a significant difference or correlation when
in fact there is. This also means we have rejected the alternate hypothesis
incorrectly. Therefore we have accepted the null hypothesis incorrectly.
Minimising errors- we can minimise type 1 errors by decreasing the probability to
0.01. Whilst this minimises type 1 errors it can increase type 2 errors. To
minimise type 2 errors, the probability has to increase to 0.1, however this can
increase type 1 errors. Usually p=0.05 is used as a probability level as it is a
compromise between type 1 and 2 errors.

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