LFS 252 Study Guide - Final Guide: Type I And Type Ii Errors, John Tukey, Standard Deviation
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1 ok 2 good 3 dislike -> results: 1,2,3,2,3,2,1 -> still categorical//categorical data in two- way tables : counts and frequency//understanding causality: designing experiments1. Double blind study ( ideal, but not necessary for the experiment) : when the person collecting the data doesn"t know which treatments the participates are taking. Center:- typical value: higher number in the middle-> normal distribution ( bell shape)- non typical value: lower number in the middle -> bimodal or skewed distributions. Variability: low- numbers distribute only in certain intervals ( total 5 intervals but number mostly spread out 2 intervals//high- number spread out even. Use empirical rule (approximate):1sd: 68 % of samples fell in between 1sd away from mean,2sd : 95. / sy, sx= sd/y-intercept is predicted value when it makes sense to have a value of 0 for x////slop( b) is only meaningful when the data follows a.
