The statistics displayed are:
1.the average or mean value of the variable, x or y ;
2.the standard deviation assuming the data points are a sample from a population, sx or sy;
3.the standard deviation assuming the data points represents the entire population, σ x or σ y;
4.the sum of the values, ∑ x or ∑ y;
5.the sum of the squared values, ∑ x 2 or ∑ y 2;
6.the number of data points, n;
7.the minimum variable value, xmin or ymin;
8.the maximum variable value, xmax or ymax; and
9.the sum of the x and y products, ∑ xy.
Your students may have trouble with conceptualizing the meaning of standard deviation. Tell them it is a measure of variability (dispersion) that is related to the average deviation or average distance from a data value to the mean.
28Numerical Description of a
