PSYC 2002 Lecture Notes - Lecture 9: Regular Language, Type I And Type Ii Errors, Statistical Hypothesis Testing
Document Summary
Normal distribution table: we have z scores that you can look up. Corresponding to them is the percentage from the mean to the z score. Because the distribution is bilaterally symmetrical, in order to determine the coloured area, we are going to take 50%, and subtract the area before. 24: look up . 24 in column z, the % mean to z is 9. 48, 50% - 9. 48% = 40. 52% This corresponds to the value that we want: 9. 48%, we need to add to that. Look up . 24 in the table: do the same things for 1. 2, get 38. 49% If you take the difference between 39. 49% - 9. 48% = 30. 01% Instead of sd, we are going to use the serror, an estimate of how accurate your sample is in capturing the mean characteristics in the population: =(cid:3005) (cid:3015, those two quantities determine how the sample corresponds to the population. As n gets bigger, it reduces the sampling error.
