A random sample of fifteen pairs of sisters was selected to

A random sample of fifteen pairs of sisters was selected to compare preference toward two brands of hair coloring. The degrees of freedom distribution test is 28. True False Not enough information

Solution

Total degrees of freedom is given by n-k

n = total sample = 15 * 2 (15 pairs) = 30

k = choice in samples = 2

Degrees of freedom = 30 - 2 = 28

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