Two types of error that must be considered when making many comparisons are per-comparison error and familywise error. Familywise error can be calculated with the formula _____. Multiple choice question. FW = k - 2, where k is the number of groups FW = 1 - (1 - )c, where is an alpha level FW = k - 1, where k is the number of treatments FW = k (n - 1), where k is the number of groups and n is the number of subjects in each group