PSY 202 Homework 3 KEY.pdf - This material may not be distributed without the explicit consent from its author Dr Nick Prins Homework 3 PSY 202 Prins

PSY 202 Homework 3 KEY.pdf - This material may not be...

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Homework 3. PSY 202 Prins. 56/56 = 100% Name:__________________________________ Write your final answers on the lines. Show your work. 1. True or False? (circle correct answer) 3 points each T F Using a p cut-off value of .01 (1%) rather than .05 (5%) will make it harder to reject TRUE the Null Hypothesis. In step 3, you will find that the cut-off sample score(s) is/are more extreme when p = 1% compared to 5% T F If you use a two-tailed (non-directional) test you will need a more extreme sample TRUE score in order to reject the Null Hypothesis compared to when you use a one-tailed (directional) test. Try it T F When you end up rejecting the Null Hypothesis, you do so because it was unlikely TRUE that you would have gotten your sample score in case the treatment had no effect. Yes. You figure out what is likely to happen if the treatment has no effect. If something else happens, you conclude that the treatment probably did have an effect. T F You can only reject the Null Hypothesis and claim your treatment has an effect if FALSE there is no chance whatsoever that your extreme sample result could have been a ‘lucky draw’. You can reject the NH if the chance that your sample result was a lucky draw was very small (less than 5% chance [if p cut-off is 5%] or less than 1% [if p cut-off is 1%]). 2. Information you need to know for this question: In the general population, IQ scores are distributed approximately normal with μ = 100 and σ = 15. A researcher develops a pill that she thinks will dramatically increase IQ scores. She finds a random individual and gives him this pill. After that, she measures his IQ, which turns out to be 140. The researcher is glad, because 140 is a really high IQ score (if a person’s IQ is 130 or more he or she is considered a ‘genius’) so it seems that maybe the pill worked. However, she also realizes that there may be another reason that her subject has a high IQ: Maybe she just picked an individual for her experiment that happens to have the extreme IQ score of 140 and the pill had nothing to with it.
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  • Fall '08
  • Johnson
  • Null hypothesis, Intelligence quotient, researcher

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