Instruction 11-3
a Realtor Wants to Compare the Average Sales-To-Appraisal

Instruction 11-3
A realtor wants to compare the average sales-to-appraisal ratios of residential properties sold in four neighbourhoods (A,B,C,and D) .Four properties are randomly selected from each neighbourhood and the ratios recorded for each,as shown below.
A: 1.2,1.1,0.9,0.4 C: 1.0,1.5,1.1,1.3
B: 2.5,2.1,1.9,1.6 D: 0.8,1.3,1.1,0.7
Interpret the results of the analysis summarised in the following table:
$\begin{array}{llclcl}\text { Source } & \text { df } & \text { SS } & \text { MS } & \text { F } & \text { PR }>\text { F } \\\hline \text { Neighbourhoods } && 3.1819 & 1.0606 & 10.76 & 0.001 \\\text { Error } & 12 & & & &\\total&&4.3644\end{array}$
-Referring to Instruction 11-3,the among group degrees of freedom is

A) 4.
B) 16.
C) 3.
D) 12.