PSY 1167 Study Guide - Midterm Guide: Frequency (Statistics), Histogram, Percentile Rank
11 Mar 2014
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Document Summary
Chap 1: descriptive statistics- organize and summarize observations. Inferential statistics- draw conclusions, interpret data: statistics- science of classifying, organizing, and analyzing data, sample- a subset of a population, statistic- describes a sample, parameter- describes a population. Interval- used with quantitative data, scale with equal intervals (no true zero: nominal- used with qualitative data, female, male, republican (named, ordinal- used with ranked data, 1st, 2nd, fresh, soph (ranked) Extend from the smallest unit of measurement to the largest for a given interval. Gaps of 1 between adjacent intervals (20-29, 30-39: real limit. No gaps when determining the actual width of a class interval, Extend upper and lower limits by . 5: relative frequency distributions. Shows proportion or percentage of the total number of observations. Proportion: divide frequency (f) of each class by the total frequency count (n), ranges from 0-1, total sum=1. Percentage: multiply each proportion by 100, ranges 0-100%, total sum=100: cumulative frequency distributions:
