1. 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

3. 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.