Statistics sheet - THANK YOU! 030 Please mark the best response for each multiple choice item. DO NOT write on this test Final Exam 1. Which of the following is used for statistical inference a. Fobto b. tobt e. robt d. all of the above 2. In an playing. The independent variable is of the subjects do the memory task with music playing; the other half do it with no music experiment a research psychologist has his subjects memorize short words. Half a. music (music playing or music not playing) b, the number of words remembered c. the research psychologist (his status as a professional) d. the research subjects 3. Regarding problem 2, the dependent variable is a, music (music playing or music not playing) b, the number of words remembered c. the research psychologist d. the research subjects 4. What is the scale of measure for the variable “brand of butter?" a. nominal b. ordinal c. interval d. ratio 5. A cumulative graph a. can never parallel the X axis b. usually slopes downward c. can only be used when data are quantitative d. all of the above AR Oui 6. The highest value in the cumulative frequency (el) column must be equal to a N b. K e. P d. Sx 7. What is the value of the median of the following scores? X = 1, 2, 2, 2, 3, 4, 6, 7, 9, 9, 10 a, 3 b. 4 c. 5 d. all of the above 8. What is the value of the mode of the scores in problem 7? a. 1 b. 2 c. 5 d. 8 9. What is the value of the mean of the scores in problem 7? a. 3 b. 4 c. 5 d. 6 10. Which central tendency is most appropriate to report for the scores in problem 7? a. mean b. mode c. median d. standard deviation 11. What is the value of the estimated population standard deviation of the following set of scores? X = 2, 6, 8, 8, 10, 14 a. 16 b. 10 c. 4 d. 2 12. Roberto has a test score of 76. The mean is 70 and the standard deviation is 6. What is Roberto's percentile? a. 16 b. 34 c. 68 d. 84 standard deviation? 13. Assuming the average man weighs 170 lbs (u=170). What is the most logical a. 30 lbs b. 90 lbs c. 150 lbs d. 300 lbs +1.0 and a z score of - 1.00? 14. In a normal distribution, what proportion of the population score between a z score of a. 91% b. 84% c. 68% d. 09% 15. If the coefficient of determination (r squared) equals 0.50, a. 50 percent of the variation in Y is accounted for by X b. the X variable perfectly predicts the value of the Y variable c. the correlation equals zero d. the variables are related but are not quantitative 16. Dr. Snile computes a correlation value of 0.70 between daily temperature and the number calls to the police department reporting domestic violence a. daily temperature is unrelated to the number of domestic violence b. generally, the hotter the temperature the more domestic violence calls occur c. predictions of number of calls based on temperature are useless d. daily temperature and number of calls made can't be tested using correlation since they are qualitative variables G H F s D This N M c V B 1 Z D 17. In a regression analysis, Y-35X + 25 for each additional value of X, Y is expect to increase by a. 25 b. 30 c. 35 d. 60 18. You are testing a claim made in a health magazine. The null hypothesis is that is that that the mean differs from 3,000 per day. A representative sample of adult males yields a the mean intake of calories per day for adult males is 3,000. The alternative hypothesis is mean of 3.200 calories. The results show " obt" = 2.55, t crit = 2.021. What is the best conclusion in this case? a. adult males generally don't eat enough b: adult males, as a population, consume more than 3,000 calories per day c. t crit can't be more than 1, so the report is incorrect d. adult males, as a population, consume significantly less than 3,000 calories per day. 19. If the significance level, alpha=0.05 then a. If Ho is rejected, there is at least a 95% probability that Ho is reasonable b. If Ho is rejected, there is at least a 95% probability that Ho is truly false c. if Ho is retained, there is at least a 95% probability that Ho is false d. if Ho is retained, it is time for the statistician to retire 20. If one does NOT reject Ho (that is, if one retains Ho) a. the decision regarding Ho is incorrect b. a type II error is possible c. a type II error has happened d. all of the above 21. The null hypothesis is that you are innocent of murder. If you are found guilty of the crime a. a type I error has occurred b. a type I error is possible c. a type II error is possible d. a type II error has occurred students 22. Which would require the use of the related-samples t-test? a. a comparison of scores on two quizzes given in the same class to the same c. a comparison of people in a control group to people in an experimental group b. a comparison of people from different cultures on a quantitative variable d. a comparison of grade-point-averages of students from two different colleges on a qualitative variable 23. If tobt 1.34, df = 22, 2=0.05 a. Ho should be retained b. Ho should be rejected c. Ha should be retained d. Ha should be rejected 24. If p > 0.05 (and a = .05) a. Ho should be retained b. Ho should be rejected c. Ha should be retained d. Ha should be rejected 25. If one is found guilty" of a crime, he/she a. has been proven to be guilty b. has been proven to be innocent c. is most likely innocent d. is most likely guilty although he/she could be innocent 26. The null hypothesis is that the mean temperature at noon is 72 degrees during the spring months. The alternative hypothesis is that the mean is not 72 degrees. If N = 20, 2 = 0.05, what is the tcrit value? a. 2.093 Logo b. 2.960 c. 1.745 d. 1.102 27. Regarding problem # 26, if tobt = -0.22, the conclusion would be ld to a. the mean of 72 is too high b. the mean of 72 is too low c. the mean of 72 is perfect d. the mean of 72 reasonable
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