STAT 100 Chapter 12: Chapter 12 STATS.docx

• School: Simon Fraser University
• Department: Statistics
• Course: STAT 100
• Professor: Derek Bingham

Document Summary

Median is the midpoint, the value that separates the smaller half from the larger half. Quartiles get their name because with the median they device the observations into quarters. The median to describe center, the quartiles are spread. The overall median is not included in the observations considered to be to the right of the overall median. The five-number summary of a distribution consists of the smallest observation, the first quartile, the median, the third quartile, and the largest observation, written in order from smallest to largest. Because boxplots show less detail than histograms or stemplots, they are best used for side by side comparison of more than one distribution. The mean x bar of a set of observations is their average (x bar = sum of the observations / n) Standard deviation s measures the average distance of the observations from their mean. Find the distance of each observation from the mean and square each of these distances.