Working with levels of significance

Match the following

• 1 in a 1000 results are chance

• 0.1% level of significance

• 1/100 results due to chance

• 5% level of significance

• 10 / 100 results due to chance

• 0.5% level of significance

• 5 in 100 results due to chance

• 10% level of significance

• 1 in 200 possibility

• 1% level of significance

Psychologists use a P<0.05 level of significance as it offers a _______ between committing a type 1 and type 2 error.

A type one error is when we ______ the null although we should have _______

A type two error is when we accept the ____ hypothesis when we should have rejected it.

A type one error is when we:

• reject the alternative although we should have accepted it

• accept the alternative although we should have rejected it

• rejected the null although we should have accepted it.

• accepted the null although we should have rejected it.

A type two error is when we...

• reject the alternative although we should have accepted it

• accept the alternative although we should have rejected it

• reject the null although we should have accepted it

• accept the null although we should have rejected it.

A type one error is more likely to occur when the level of significance is...

• lenient

• stringent

• at a P<0.01 level than a P<0.1 level

• at a P<0.1 level than a P<0.01 level

A type two error is more likely to occur when the level of significance is...

• lenient

• stringent

• A P<0.01 level is used rather than a P<0.1 level

• A P<0.1 level is used rather than a P<0.01 level

Explain what the terms 'stringent' and 'lenient' mean when talking about levels of significance.

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Which level of significance is the preferred choice for psychologists (write out as the probability fomula P< etc) and explain why?

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