A store manager wishes to investigate whether there is a relationship between the type of promotion offered and the number of cu
stomers who spend more than $30 on a purchase. Data will be gathered and placed into the two-way table below.
1 answer:
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Answer:
d. 2 in the numerator, 15 in the denominator
Step-by-step explanation:
Analysis of variance (ANOVA) "is used to analyze the differences among group means in a sample".
The sum of squares "is the sum of the square of variation, where variation is defined as the spread between each individual value and the grand mean"
If we assume that we have groups and on each group from
we have
individuals on each group we can define the following formulas of variation:
We want to test this hypothesis:
And we have this property
The degrees of freedom for the numerator on this case is given by where k =3 represent the number of groups.
The degrees of freedom for the denominator on this case is given by .
And the total degrees of freedom would be
On this case the correct answer would be 2 for the numerator and 15 for the denominator.
d. 2 in the numerator, 15 in the denominator