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The first version of the SON test was developed more than seventy years ago by psychologist Nan Snijders-Oomen, to study the cognitive functioning of deaf children. The goal of this test series was to break the one-sidedness of the non-verbal performance tests of that time and to broaden the functions accessible for non-verbal intelligence research.
Student's t-test assumes that the sample means being compared for two populations are normally distributed, and that the populations have equal variances.Welch's t-test is designed for unequal population variances, but the assumption of normality is maintained. [1]