STAT 2 Lecture Notes - Lecture 18: Mexican Peso, 2Degrees, Statistical Hypothesis Testing
28 Mar 2018
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Document Summary
Chi square is used to compare data that has more than two categories. How to know when to use chi square test versus z test. The 2 test says whether the data are like the result of drawing at random from a. The z test says whether the data are like the result of drawing at random from a. If we have more than two categories then we use chi square instead of z test box with contents are given box whose average is given. Large chi square values implies that the expected and observed values are very far apart. now need to find the probability of obtaining the difference of observed and expected frequencies by14. 2 or more. Degree of freedom=number of values of 2 -1 =6-1=5. The total observed frequencies add up to 60. If we know five of them then the last one can be calculated.
