Chi-square distribution introduction

Level: beginner

Khan Academy, 2011
Topic: methodology
Format: Tutorial
Duration: 00:10:23
Link: https://www.youtube.com/watch?v=dXB3cUGnaxQ
The definition of a chi-square distribution is given. Chi-square is defined as the sum of random normally distributed variables (mean=0, variance=s.d.=1). The number of added squared variables is equal to the degrees of freedom. With more degrees of freedom the probability of larger chi-square values is increased.
Tags: chi-square | degree of freedom | mean | normally distributed | p-value | probability | variance
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