
degrees of freedom
 subtracting a number (usually 1 or 2) from a sample (N or n), a group (K), a row (R), a column (C), or other subset designation.
 N1.
 free to vary.

nonparametric
statistical procedures used with variables measured at the nominal or ordinal level  “distributionfree”

parametric
statistical procedures appropriate for variables measured at the interval or ratio level  assume normality

Chisquare statistic (crosstabs) (Contingency table)
 Extension of the goodness of fit test  can measure 2+ variables simultaneously;
 a measurement of observed versus expected frequencies and outcomes

statistically significant
if the chisquare value equals or exceeds the value in the table based on df and probability, then the differences in observed frequencies are __________ at that alpha level

ttest
 most elementary method of comparing two groups' mean scores
 variations include: testing independent groups, related groups, and cases in which the population mean is known/unknown
 assumes normal distribution and homogeneity of variance

linear regression
numerical expressions of the degree to which two variables change in relation to each other

Pearson r
 1) An estimate of the strength of the relationship, as indicated by the number;
 2) A statement about the direction of the relationship, as shown by the + or  sign;

