Psychology 2810 Lecture Notes - Blood Test, Concurrent Validity, Discriminant Validity

• School: Western University
• Department: Psychology
• Course: Psychology 2810
• Professor: Doug Hazlewood

Document Summary

Systematic error (or bias) (was everyone wearing shoes when measured?) Observed score = true score +/- random error + or - systematic error (or bias) We must minimize random error and systematic error (so observed score = true score). By maximizing the reliability and validity of measures. Part 1: reliability (minimizing random error: the more is better rule (random error will cancel out over repeated measurements) Playing 1 on 1 - we start with the ball. You can choose to either play whoever gets to 20 baskets first, or whoever gets the first basket wins. We can take advantage of random error to our advantage to win the basketball match in this situation. However, if we were to choose playing 20 baskets, it would be very unlikely to get lucky" getting 20 baskets in. Example 2: grandfathers who cant believe that he has 1 grandchild who happens to be a boy.