What it does: The Independent Samples T Test compares the mean scores of two groups on a given variable. · Where to find it: Under the Analyze ... ... <看更多>

If the samples have equal variance then an independent-sample t-test (Student's t-test) could be used. If the samples have unequal variance then the Welch's ... ... <看更多>

The two-sample t-test does assume equal variances in the two groups. There is a slight modification called the Welch t-test that accounts for unequal variances. ... <看更多>