PSYC2203 Study Guide - Final Guide: Statistical Significance, Level Of Measurement, Frequency Distribution
Document Summary
Scales of measurement: nominal scale numbers are labels, no averaging, frequency distribution table/bar graph, mode, ordinal scale numbers are ranks, not magnitudes, no averaging, frequency distribution table/bar graph, median, range. Freq. distribution tables: helps us notice outliers, x = values of variable, f = n = sample size, data from ordinal or ratio/interval scale list all values min max f = freq. Grouped freq. distribution tables: usually only for interval/ratio scales, no more than 10 20 intervals/bins, use simple numbers as bin width (e. g. 5, 10, 20, 50, bottom score in each interval = multiple of bin width (e. g. 0 4, 5 9, 10 14) Height of y axis should be 2/3 of x axis height: can use normal or relative freq. s (fraction/%, grouped freq. dist. graphs write intervals on x axis, bar graph (ordinal/nominal scale, vertical bars don"t touch discrete variable, +ve skew long tail on right (e. g. household size)
