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their non-preferred hand. Analyze the data and compare the results to those for the previous problem. 10. You have 4 means, and you want to

their non-preferred hand. Analyze the data and compare the results to those for the previous problem. 10. You have 4 means, and you want to compare each mean to every other mean. (a) How many tests total are you going to compute? (b) What would be the chance of making at least one Type I error if the Type I error for each test was . 05 and the tests were independent? (c) Are the tests independent and how does independence/non-independence affect the probability in (b). 11. In an experiment, participants were divided into 4 groups. There were 20 participants in each group, so the degrees of freedom (error) for this study was 80 - 4 = 76. Tukey's HSD test was performed on the data. (a) Calculate the p value for each pair based on the Q value given below. You will want to use the Studentized Range Calculator. (b) Which differences are signicant at the .05 level? Comparison of Groups A-B A-C A-D B-C B-D C-D Q 3.4 3.8 4.3 1.7 3.9 3.7 12. If you have 5 groups in your study, why shouldn't you just compute a t test of each group mean with each other group mean? 13. You are conducting a study to see if students do better when they study all at once or in intervals. One group of 12 participants took a test after studying for one hour continuously. The other group of 12 participants took a test after studying for three twenty minute sessions. The rst group had a mean score of 75 and a variance of 120. The second group had a mean score of 86 and a variance of 100. a. What is the calculated t value? Are the mean test scores of these two groups signicantly different at the .05 level? b. What would the t value be if there were only 6 participants in each group? Would the scores be signicant at the .05 level? 444 compared. (There were 100 subjects in each group.) The mean score of the experimental group was 503 and the mean score of the control group was 499. The difference between means was found to be signicant, p = .037. What do you conclude about the effectiveness of the class? 13. Is it more conservative to use an alpha level of .01 or an alpha level of .05? Would beta be higher for an alpha of .05 or for an alpha of .01? 14. Why is \"Ho: \"M1 = M2\" not a proper null hypothesis? 15. An experimenter expects an effect to come out in a certain direction. Is this sufcient basis for using a one-tailed test? Why or why not? 16. How do the Type I and Type II error rates of one-tailed and two-tailed tests differ? 17. A two-tailed probability is .03. What is the one-tailed probability if the effect were in the specied direction? What would it be if the effect were in the other direction? 18. You choose an alpha level of .01 and then analyze your data. a. What is the probability that you will make a Type I error given that the null hypothesis is true? b. What is the probability that you will make a Type I error given that the null hypothesis is false? 19. Why doesn't it make sense to test the hypothesis that the sample mean is 42? 20. True/false: It is easier to reject the null hypothesis if the researcher uses a smaller alpha () level. 21. True/false: You are more likely to make a Type I error when using a small sample than when using a large sample. 22. True/false: You accept the alternative hypothesis when you reject the null hypothesis. 23. 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