Flashcards in Interpreting evidence 2 Deck (7)

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1

## what is a confidence interval

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a range of values where there is a certain probability that the true value lies within the range

can indicate clinical significance

2

## what is a chi squared test

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used to examine difference within catergorical values

allows us to determine if the difference between the observed and expected numbers is different

3

## what is a P value

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the probability that the observed relationship occurred by chance

an arbitrary cut point is chosen

when the P value is below the cut point we reject the null hypothesis

4

## what is a T test

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used to determine whether two means are significantly different from each other

gives a probability that the difference would be found by change if the null hypothesis is true

e.g. the mean score from my experiment is no different from that found in a publication

5

## what is the formula for the T test

### t = (smple mean - hypothesized mean )/ SE of sample mean

6

## what is correlation

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measures the strength of relationship between two numerical variables

measured by the correlation coefficient (r) which varies between -1 and +1

a significant correlation coefficient is indicated by a P value in a statistical package

7