A realtor wants to compare the mean sales- to- appraisal ratios of residential p

Question

A realtor wants to compare the mean sales- to- appraisal ratios of residential properties sold in four neighborhoods (A, B, C, and D), Four properties are randomly selected from each neighborhood and the ratios recorded for each, as shown below. Interpret the results of the analysis summarized in the following table: MS PR>F 3.1819 1.0606 1076 0.001 Neighborhoods Error Total 12 4.3644 Referring to Table 1 1-2 the numerator and denominator degrees of freedom for Levene's test for homogeneity of variances at a 5% level of significance are, respectively, O A. 3, 15. O B. 12, 3. o C. 3, 12. o D. 15,3.

Explanation / Answer

The degrees of freedom for the numerator are the degrees of freedom for the between group (k-1) and the degrees of freedom for the denominator are the degrees of freedom for the within group (N-k).

Thus numerator degrees of freedom is:4-1=3

The denominator degrees of freedom is: 16-4=12

The required answer is C. (3,12)

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