Instruction 3-7
Given Below Is the Frequency Distribution of the 12-Month

question 4

Short Answer

Instruction 3-7
Given below is the frequency distribution of the 12-month rate of return achieved by 30 stocks.
$$\begin{array} { | c | c | } \hline \text { 12-month Rate of Return } & \text { Number of Funds } \\\hline - 0.10 \text { but less than } 0.0 & 3 \\\hline 0.0 \text { but less than } 0.1 & 5 \\\hline 0.1 \text { but less than } 0.2 & 6 \\\hline 0.2 \text { but less than } 0.3 & 10 \\\hline 0.3 \text { but less than } 0.4 & 6 \\\hline\end{array}$$
-Referring to Instruction 3-7,what is the approximate variance?

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Definitions:

Sampling Error

The difference between a population parameter and a sample statistic that results from selecting a sample.

Expected Value

The predicted average outcome of a random variable, computed as the weighted average of all possible values.

Stratified Random Sampling

A probability sampling method in which the population is first divided into strata and a simple random sample is then taken from each stratum.

Strata

Subsets of a population that are known to be homogeneous with respect to some characteristic, used in stratified sampling.