STAT W21 Chapter 4: Chapter 4_ Measures of Location and Spread
Document Summary
Median: is the number that divides the ordered data in half. Mode: is the most common value among the data. Mean = (sum of data)/(number of data) Resistant: statistics that are not affected too much by small subsets of data (median is. A small % of very expensive homes makes the mean large but doesn"t affect the. Two countries have the same mean per capita personal income. the total personal income median much in the larger country is larger than the total personal income in the smaller country. The range, iqr, and sd standard deviation (sd) datum can make it arbitrarily large is the middle 50% of the data , it is resistant. 3 most common measures of spread or variability are range, interquartile range (iqr) and. Range: is the largest value minus the smallest value, not resistant because changing one. Iqr: upper quartile (75th percentile) minus the lower quartile (25th percentile) the width.
