STT-2810 Study Guide - Quiz Guide: Pie Chart, Face Card
Document Summary
If percentages are greater than 100%, you cannot use a pie chart. If a percentage is greater than 100%, categories overlap, so a speci c percentage cannot be determined (ex: is it safe to determine that x + y = 56%?) If a percentage is less than 100%, categories do not overlap. Iqr is the most appropriate measure of spread if there are outliers present. Median & iqr go together (skew and outliers) Addition = spread spread doesn"t change iqr, range and standard deviation. If mean < median = skewed to the left (and vice versa) How many standard deviations away from the mean? = nd the z-score. Z-score = event number - mean standard deviation. Mean is the average (a numerical measure of center) To put in min-max order: data > sort > ascending. Given %, nd z: bottom right box in decimal form (75% = . 75) (statcrunch)
