PARAMETRIC TESTS t-tests (parametric, interval and ratio data)

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Presentation transcript:

PARAMETRIC TESTS t-tests (parametric, interval and ratio data) To find if there are differences between two groups Decide whether they are are independent or related samples Independent sample: two different groups on one occasion Related sample: one group on two occasions

Read the line ‘Levene’s Test for Equality of Variances’ Read the line ‘Levene’s Test for Equality of Variances’. If the probability value is statistically significant then your variances are unequal; otherwise they are regarded as equal. If the Levene’s probability value is not statistically significant then you need the row ‘equal variances assumed’; if the Levene’s probability value is statistically significant then you need the row ‘equal variances not assumed’. Look to the column ‘Sig (2-tailed)’ and the appropriate row, and see if the results are statistically significant.