Click on an item below to see the definition
Welch's approximation:
A modified test statistic used in a two sample t test scenario when the
variances of the two groups are unequal.
Wilcoxon test:
This is the non-parametric equivalent of the paired t test. It
ranks the raw data into ascending order, then compares the total of the ranks in each group against Wilcoxon
tables.
See also Non-parametric, Paired t test.
Wilks-Shapiro test:
A test used to determine whether a sample of data could have come
from a normally distributed population.
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