Describing Scores on a Single Variable
frequency distribution; bar chart (histogram), line graph, bar graph
1. central tendency - mean; median; mode
range (sensitive to outliers)
sum of squares
variance Variance is the basis for inferential statistics such as t-test, F-test, and ANOVA.
standard deviation (original units)
(used to standardize scores)
3. skew (kurtosis)...
standard(ized) scores - m = 0, s = 1 (z-scores)
With pictures: scatterplot
correlation Pearson coefficient, r
variance accounted for
Correlation is the basis for inferential statistics such as multiple regression.