Ch 9 Vocab

Independent-groups t test A parametric inferential test for comparing sample means of two independent groups of scores. Standard error of the difference between means The standard deviation of the sampling distribution of difference between the means of independent samples in a twosample experiment. Effect Size The proportion of variance in the dependent variable that is accounted by the manipulation of the independent variable. Cohen's d

An inferential statistic for measuring effect size.

Correlated-groups t test A parametric inferential test used to compare the means of two related (within- or matched- participants) samples. Difference scores Scores representing the difference between participants' performance in one condition and their performance in a second condition. Standard error of the difference scores The standard deviation of the sampling distribution of mean differences between dependent samples in a two-group experiment. Wilcoxon rank-sum test A nonparametric inferential test for comparing sample medians of two independent groups of scores. Wilcoxon matched-pairs signed-ranks T test A nonparametric inferential test for comparing sample medians of two dependent or related groups of scores. Chi-Square test of independence A nonparametric inferential test used when frequency data have been collected to determine how well an observed breakdown of people over various categories fits some expected breakdown. Phi coefficient test.

An inferential test used to determine effect size for a chi-square