STAT 1430 Lecture Notes - Lecture 7: Scatter Plot, Aspirin
30 Jan 2019
School
Department
Course
Professor
STAT 1430 verified notes
7/30View all
Document Summary
Residual plot l a u d i s e. Problems found: patterns and fans: fan pattern, curve pattern. Wal-mart: within the data set y away from the other points. Seeing ads vs. making a purchase: survey of 200 people leaving a retail outlet, did they see the ad in the newspaper, did they make a purchase, overall distribution: 36 saw the ad and made a purchase(18%) 84 saw the ad but dud not purchase(42%) 24 didn"t see the ad and made a purchase(12%) 56 didn"t see the ad did not make a purchase(28%) Joint ( and ) distribution: overall percentage in each cell. Separate (marginal) distributions: distribution of one variable showing its overall results. 200: breakdown one group by the other variable used to compare groups. Conditional distribution of purchase for those who saw ad. Is x related to y? method 1: compare the conditional distributions.
