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

question 39

Multiple Choice

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 within group sum of squares is

• A)3.1819.
• B)1.0606.
• C)1.1825.
• D)4.3644.

---

Definitions:

Simple Random Sample

A simple random sample of size n from a finite population of size N is a sample selected such that each possible sample of size n has the same probability of being selected.

Probability

An indicator of the probability that a particular event will take place, represented by a numerical value ranging from 0 to 1, with 0 meaning the event cannot happen and 1 meaning the event is certain to happen.

Population

Every individual or item under consideration in a statistical evaluation.

Probability Distribution

A mathematical function that provides the probabilities of occurrence of different possible outcomes in an experiment.