9-5-08 - Psychology 206 Class Notes TODAY Lets get started...

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Psychology 206 – Class Notes – 9/5/08 TODAY : Let’s get started o Exercise #2 (and a word about grading of exercises) o Exercise #3 questions Random assignment and random sampling Reliability and validity of measurements Student graders do a once through and then she also grades papers She is NOT stingy with the homework worksheet points – you can miss a couple and still get 3/3 points (each assignment is worth 3 points) Student graders might put in a little bit extra on a particular problem, even though your answer was sufficient – in this case, just ask her what you should really have TRYING TO MAKE IT ABSOLUTELY CLEAR WHAT THE DIFFERENCE BETWEEN RANDOM ASSIGNMENT and RANDOM SAMPLING Random sample? If there is a random sample (is there a random sample or a “convenience sample”), then you can generalize findings to target population. o The sample is representative of the larger population o It is a TRUE RANDOM sample if every member of the population has an EQUAL probability of being selected o It is difficult to get a true random sample (because people sometimes may not show up for the experiment, which then makes the study NOT a random sample) o THE KEY : If you have a random sample, you can generalize findings to the target population.
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