STAT 101 Chapter Notes - Chapter 3: Standard Deviation, Quartile, Statistical Inference

• School: Simon Fraser University
• Department: Statistics
• Course: STAT 101
• Professor: Rick Routledge

Document Summary

Plot your data, usually a histogram or stemplot. Calculate a numerical summery to describe the center and spread. Density curve a curve that approximately describes the overall pattern of a distribution. Median the point with half the observations on either side. Mean ( ) the point at which the curve would balance if made of solid material. Quartiles divide the area under the curve into quarters. Of the area is left of the first quartile. Of the area is left of the third quartile. The mean is pulled to the direction of the long tail in a screwed density curve. Mean ( ) the center of the symmetric normal curve. Standard deviation ( ) the distance from the center to the change-of-curvature points on either side. All normal curves have the same overall shape: symmetric, single-peaked, bell-shaped. Any specific normal curve is described by its mean, and standard deviation.