Psychology Statistics Midterm Review: Descriptive Statistics and Hypothesis Testing, Exams of Psychology

Download Psychology Statistics Midterm Review: Descriptive Statistics and Hypothesis Testing and more Exams Psychology in PDF only on Docsity! Psych Stats Midterm Nominal Data - Data which consists of names, labels, or categories. ordinal data - a type of data that refers solely to a ranking of some kind z score formula - z = (x - μ)/σ standard deviation - the square root of the variance IQR (interquartile range) - measure of statistical dispersion, being equal to the difference between the upper and lower quartiles, IQR = Q3 − Q1. Mean symbol for population - μ Mean symbol for sample - m Variance symbol (population) - σ Variance symbol (sample) - S standard deviation symbol for sample - S^2 standard deviation symbol for population - σ^2 z table - A table containing a list of z scores and the area of the curve that is between the distribution mean and each individual z score. Null Hypothesis (H0) - the hypothesis that there is no significant difference between specified populations, any observed difference being due to sampling or experimental error. Alternate Hypothesis (H1) - A statistical hypothesis that offers an alternative to the null hypothesis when the null is rejected. negatively skewed - a distribution that trails off to the left positively skewed - a distribution that trails off to the right quasi-experiment - An experiment in which investigators make use of control and experimental groups that already exist in the world at large. Also called a mixed design. frequency distribution -