SOCR 330 Study Guide - Quiz Guide: Type I And Type Ii Errors, Statistical Hypothesis Testing
Document Summary
A simple statistical method based on probability theory. Valuable statistical test to detect deviation from mendelian ratios. Using the chi-square test for goodness of fit. You suspect flower color in poppies is controlled at a single locus with red r dominant to white r. You cross rr x rr and get 100 offspring. Based on mendelian genetics you predict a 3:1 ratio so you expect 75 red poppies and. You actually get 61 red and 39 white. This is a significant value for chi-square on 1 d. f. so these numbers do not support a hypothesis predicting 3:1 segregation. Important points to remember when using the chi-square test for goodness of fit. Chi-square values in the p=0. 05 column are exceeded by chance 1 in 20 times (so 5% chance of a type ii error) Chi-square values in the p=0. 01 column are exceeded by chance 1 in 100 times (so 1% chance of a type ii error)
