Question

13. Measures of variability match-up Aa Aa E There are multiple ways to refer to or describe a variance or a standard deviation of either a population or a sample. Likewise, each measure has multiple appropriate equations or symbols. The left table consists of alternative ways of referring to each of these measures. The right table consists of equations or symbols for each of these measures. Alternative Description a. Average squared distance from b. Standard distance from C. Average squared distance from M d. A measure of the average distance from the sample mean Equation or Symbol 1. Vo2 2. (X - )2 /N 3. X(X - M)2 / (n-1) 4. Vs2 For each of the following four measures, select one appropriate description from the left table (lettered) and one appropriate equation or symbol from the right table (numbered). Each answer will be used only once. Alternative Description Equation or Symbol Measure Sample variance Population variance Sample standard deviation Population standard deviation

Answer 1

Measure Alternatwe Description Equation | Symbol 1. Sample variance Average distance squared from M {(X-M) 2 n-1 {(x-4) 2. Population variance Average distance squared from u I N 3. Sample standard A measure of deviation the average distance from sample mean distance to 4. Population standard deviation Standard from u