PSYC 218 Lecture Notes - Lecture 16: Type I And Type Ii Errors, Null Hypothesis
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Iclicker question 1: if the results of your experiment turn out to be extreme but in the direction opposite to your directional h1, the appropriate decision is to retain h0. What you should do instead, is simply retain the null hypothesis, A. preal = 0. 20, b. preal = 0. 30, c. pnull = 0. 50, d. preal = 0. 60, e. preal = 0. 70 answer is a. preal = 0. 20, b/c stronger in opposite direction (80% chance getting neg. Usually tied to the size of the effect. Limits the probability of type i error. Is the probability of type ii error. So, we want power to be as high as possible in an experiment. Let"s use our marijuana experiment and sign test **************** Power: probability that results of experiment will allow rejection of h0 if independent variable (iv) has real effect. Value can vary from 0. 00 to 1. 00. Power = 0. 80 or higher is desirable but rarely seen.
