In an independent t-test, you would use the ‘equal variances not assumed’ part of the output when Levene’s test is:

(a) Above a criterion signifi cance level (e.g. p > 0.05)

(b) Below a criterion signifi cance level (e.g. p < 0.05)

(c) When numbers of participants are unequal in the two conditions

(d) When you have skewed data