![]() ![]() ![]() The contrast-coefficient table is a convenient way to check that the proper weights were given to the groups. If the mean assessments of the DVD player for the 32-38 and 39-45 age groups are equal, then you would expect the observed difference in the mean assessment for these groups to be near 0. By specifying -1 and 1 as the contrast coefficients for these groups, the first contrast tests whether the observed difference is statistically significant.
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Contrast Coefficients Table |