STAT 20 Lecture Notes - Lecture 15: Root Mean Square

• School: Berkeley
• Department: Statistics
• Course: STAT 20
• Professor: Fletcher Ibser

Document Summary

He is still writing it and there will be more updates. We will have 50 minutes to complete the tes. Throughout lecture, underlined numbers refer to sections in notes_roger_purves. Ex: 3 coin tosses, count heads x p(x=x) 0 x (cid:489) + 1 x (cid:490) + 2 x (cid:490) + 3 x (cid:489) Expected value is long run average: two shortcuts, box model, one draw repesents x, then e(x)= average of tickets in box, want e(y) and t is a function of x. For example, y=g(x)=x^2 then e(y)= sum of g(value) times chance from x. Ex) x is a fair die roll: standard error. I f x= one draw from a box model. se(x)= sd of values in box. Box model of 0 and 1: alternative formula for se.