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Soc Sci 10B F05 FINAL EXAM

Soc Sci 10B F05 FINAL EXAM - FINAL EXAM PRACTICE SOC SCl...

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Unformatted text preview: FINAL EXAM PRACTICE SOC SCl 1OB :"i-qn‘rn 1}" 3!] kn cnrnn nuarign bflfillnnfl thorn nrunctlg'onc and m nco nn nr an,- an nun-1:111:- .11“, «In H'UI ll‘uv V'VGSH fa, dddddddddddddd ”HUI-‘5. van—F viii..- ‘3‘ I.._I “1"“.fi—y-.u-v .1 uuuuuu {because review questions are inciuded) Answers are on fast page. Den '7'“ forget pro: free exercises In text past QUIZZES and homeworksf Good luck! Answers are at the end by popular J-..-..._J h... AL'-L h/‘I hr'f'll'r’r'lll I'llAn'r'f‘h 4‘ 4f! :1! L- .'...-I J! filIUHU "’U1’. IVILK UU KCVJ-CVV OFTHFICK 1.1L!" H W!” UC IIILIUQZLJ! PART 1: UP TO CHAPTER 16 (ANOVA) CHANGING PLACEMENTS? ( PART 1 ) Four clients are given the lSS ( Irvine Sociopathy Scale) before (PRETESD and after (POSTTEST) spending six months in a Group Home. Ms. Alton is trying to show that there will be a reduction in sociopathy after being in the Group Home. Assume that the distributions are approximately normal. x1 PRETEST x2: POSSTTEST D: DIFFERENCE .3315 (9:213 32 40 *1 43 37 ‘ l 1. If Ms. Alton is correct." ores on X2 should be than scores on X1. A) higher i B) lower C) equal to 2. Just by looking at the data format above we can tell that this is an example of a (A) repeated measures B) between groups design C) posttest only design 3. if the null hypothesis IS true what Is pD? ""'-"\ A) less than zero B) greater than zero ( C) equal to zero 4. What Is D in this sample? What IS the mean of all difierencesk A) -0 B) -8 C) -6 D) -4 E) -5 5. What Is the best estimate of on, the standard deviation of the variable D in the population based on thIs sample9 _(Or, what Is (:0?) L.) b Inf..." . \ : ' I‘ . A) 1 8))2 C) 4 D) 1 79 E) 8 6. What Is the best estimate of the standard error of the statistic D based on this sample? (Or, what IS 609.)<A)1 B)2_ t. C)4 on. 79 E)8 7. What Is "STD D"? (or "obta1nedt") ‘v' {Ir ‘s’i " 1 '4 _t__ _. What do you get when you standardize the mean of the sample differences? ’ " A) -6 B) —4 C) -3. 35 D) —1.5 E) +5 8. What is the t critical value? (ATP—4.541 B) -5.841 C) -3.747 D) -4.604 E) -3.365 3‘ 9. Therefore, (we the null hypothesis at the .01 significance level, because P is 5A) can reject, less than .01 C) can reject. greater than .01 B) can't reject, less than .01 D) can't reject, greater than .01 Page 2 FINAL EXAM Practice SOC SCI 1OB CHANGING PLACEMENTS? (PART 2) Suppose that Dr. Jones is trying to show that clients who are placed in a Group Home (GH) will have a lower level of sociopathy after six months than would generally be expected in this population. Suppose Dr. Jones knows that clients in this population have always avera d 19".on he Irvine Sociopathy Scale, the 'ISS'. Suppose that Dr. Jones randomly picks 49 clients who have been placed in a Group Home btains these data on the ISS for the sample: i if“: j; 2 AA: i4 O\:\‘* - -ioi ._ 0:21;: Le: .2-.. as O“ 9‘ Emmi; we; 10. The shapg of the sampling distribution which is relevant to this hypothesis test " A) "is approximately normal because the sample size is large enough B) is approximately normal because the population is approximately normal C) may not be approximately normal. 11. The sampling distribution which is relevant to this hypothesis test has a mean of and a standard deviation of . . N14, 14 Mo, 2 .cihs, 14 /B‘f19, 2 E)0, 14 12. The value of P, the probability of obtaining a sample mean this low just by chance, is in this case approximately A) .9972 B) .9938 C) .0013 .0062 E) .0228 r) 13. Therefore we... the null hypothesis at the .01 significance tevel, because P is ' A) reject, less than .01 C) reject, greater than .01 B) can't reject, less than .01 D) can't reject, greater than .01 7 14. A 99% co tidence interval estimate for it based on the data above would be. ..(use 2) ‘ my i 5.16 B) 19 :r 6.45 C) 14 i 6.45 D) 19 i 5.16 E) 19 i 2.58 SOC SC] 108 FINAL EXAM Practice Page 3 CHANGING PLACEMENTS? (PART 3) Suppose that Dr. Jones is trying to show that clients who are placed in a Group Home (GH) will have a lower level of sociopathy after six months than would generally be expected in this population. Suppose Dr. Jones knows that clients in this population have always averaged 9 on the irvine Sociopathy Scale, the 'ISS', and that the distribution of scores on this variable is approximately normal. Suppose that Dr. Jones randomly picks 4 clients who have been placed in a Group Home (GH) and obtains these data on the ISS for the sample: (HINT: SEE THE DATA IN PART 2) 7 ,7 lSS f"? Obit; .f _ .3 'i, I, a 'I ‘1 ' W’ , ta 15. Using all of the'information given, estimate the standard deviation of the population that the sample was drawn from. A)4 B)6 C)3 ,D)2 E)1 16. Using all of the information given, estimate the standard error of the mean for all samples of size 4. , ,\ :— .2- : } A)5 B)6 C)3 m2 .-="E)?i ’ W l? 17. What is the standardized sample mean (or 'obtained t) “A , . - K ,W the sample was drawn from? Ci ‘3 ‘t’ ' A) —3 B) -5 C)-1 D) -9 (@4 a“, u ‘5' . _, ,5) 18. The critical value oftwhich is appropriate to use is ' -"- , ' i A) -2.896 B) -3.355 C) -3.747 D) -5.841 E) -4.541 19. Therefore we... the null hypothesis at the .01 significance level, because P is A) reject, less than .01 B) reject, greater than .01 Q)-can't reject, less than .01 ( D) can't reject, greater than .01 20. Based on the sample data only, compute a 95% confidence interval estimate for u A) 9 a 11.682 W (3:) 5 :r 11.682 as ,__ t; 4,. .1: .-- 1.“ 2,3 g ) 9 a 5.841 )4 - .. ~ g) 5 :r 5.841 t-"E)“‘5 : 3.182 Page 4 FINAL EXAM Practice SOC SCI 1GB CHANGING PLACEMENTS? ( PART4 ) Suppose that Dr. Jones is trying to show that the level of sociopathy after six months lower for clients who are placed in a Group Home (Group A) compared to clients who are returned to their Own Home (Group B). Dr. Jones draws two random samples of clients who had been incarcerated in Juvenile Hall and gives them the Irvine Sociopathy Scale, the 'ISS', six months later Sample A consists of 5 clients who were placed in a Group Home. .s .. J The mean ISS score for clients in Sample A is 20, and 88,, = 150 Sample B consists of 10 clients who returned to their Own Home 3:15. - 3"; The mean ISS score for clients in Sample 8 is 27.5, and 88B = 240 Assume that both groups have approximately normal distributions and that both groups have equal variances )2? 5 J , w- .- . , _ "ft-J _ . i; in ‘ t I! t’ y: r‘ . _ J \.-.- J." NOTE. You may assume that hypotheses about differences are stated in the usual order, i. e. Lit“: u u u u _ .2; p “ ‘ Q-“l' : W A- B ,notB— A. ii;fi 9?. an“): ‘ :PHJZ’BF” 21. Using all of the information given, estimate the variance of each of the groups in the population. (Because Athere' s only one estimate for both groups this is called the 'pooled estimate) Q) )30 B) 390 C) 26 D) 9 E) 3 22. LJsing all of the information given, estimate the standard error of the sample difference—KM” X A — KB, based on the data above A) A30 B) 390 C) 26 o) 9 P} 23. if the null hypothesis is true then the sampling distribution of X A X3 in this case has a mean of and a standard deviation estimated to be A)O... 30 3) 7.5... 3 (6370... 3 D)O... E)o... 75 24. What is the ‘obtained sample difference’ in this case? " ff": ' i . ‘ ”i , ’j , F ‘_ _ , A)~13 (3’)J.5 C)11 D)-11 E)—2.5J 7» m i). w? 25. How far wo\uld you expect the obtained difference to be from the population difference? (.ZL ' 3 ’ 4F _' W3 3)0 C) 8 D) 30 E) 7 5 ’3 26. The standardized sample differen%also referred to as "obtained t" or "the test statistic" ‘ is”? A) -2.0 3) —2.75 C) —2. 5 D) 2.0 E) 3 27. The appropriate critical value oftin this case is ~ ‘ — - ' " - ll ' ' A) -3.012 B)—2.602 C) 2492 o)—2.947 ®‘=—2_650 28. Therefore we... the null hypothesis at the .01 significance level, because P is A) reject, less than .01 Lireject, greater than .01 B) can't reject, less than .01 if )can'treject, greater than .01 SOC SCI 1OB FINAL EXAM Practice Page 5 PART 2: ANOVA INTRODUCTION (16.1) 29. If there's a relationship between the variable X and the Variable Y, you definitely can conclude that... (Read all answers) NW A) X causes Y, at least in part cores on X are higher than scores on Y $043“ ‘Jr i W‘ Vat +£W @nowing scores on X would allow you to predict scores on Y better. ) more than one of the above is correct 30. You would use a One Way ANOVA if you were investigating the relationship between... A) Ethnicity and Gender B) Height and Weight Birth Order and Rank in Class D),‘Favorite Color and Level of Depression E) none of the above 31. The ‘SSTOTAL’ (0r, ‘sum of squared deviations from the mean') for the variable X in a One Way ANOVA represents variation that A) is definitely due to the independent variable 8) is definitely due to error C) is definitely due to the dependent variabie D) might be due to the independent variable .—__________________________.__—___—__—_____________..----——___-—___-—-—___________..-----....~.———————_—________....-_-—___________ 7913 Page 6 FINAL EXAM Practice 300 SCI 103 THE BLAIR STA TS PROJECT Suppose two camp counselors disagree about the effect of movies such as The Blair Witch Project. AI thinks that EXPOSURE to the film will increase anxiety. Specifically, Al thinks that the young student campers who have seen the film (Group 1) will have higher ANXIETY about camping in the woods compared to student campers who have not seen the film (Group 2). Ned thinks that both groups will have equal anxiety. They pick at random 4 student campers who have seen the film and 4 who have not seen it. Each camper's level of ANXIETY about camping in the woods. Assume that both groups have population distributions that are approximately normal, with equal variances. The data obtained are shown in TABLE 1 below, where i represents FILM EXPOSURE, and X is the level of ANXIETY. Perform the appropriate One Way ANOVA on these data. NOTE: X = 4 SS-ro'rAL , the sum of squares for X, is 96 x1=1 x2=7 TABLE 1 Name i X (Exposure (Anxiety) Fay -n-- Glee n-------- Hal n-------- 32. The null hypothesis will be true if... "A) in the sample, both groups have equal ANXIETY B) in the population, both groups have equal ANXIETY C) neither of the above is correct. SOC SCI 1OB FINAL EXAM Practice Page 7 BLAIR STATS PROJECT (continued) 33. Hal's deviation from X the grand mean, is , A) -1 B) +1 C) —4 .+4 E) +8 34. Hal is in Group 2. Hal's deviation from his group mean is A) -1 @1 C) —4 0) +4 E) o 135. Theindependent variable in this study is the ‘ ‘A)}nominai scale variable 'EXPOSURE TO THE FILM' B) interval scale variabie 'EXPOSURE TO THE FILM' C) nominal scale variable 'ANXIETY' D) interval scale variable 'ANXIETY' E) difference between the two groups on ANXIETY 36. SSBETWEEN, the sum of squares between groups, is A) 12 B) 24 C) 36 {mm E) 4 37. SSWWH." , the su u of squares within groups, is A) 12 ‘4 C) 36 D) 72 E) 4 38. DFWHHN, the degrees of freedom within gro s, is (if-vim ‘ n- it : 93¢ 7.: (p A) 1 B) 2 C) 4 fife E) 7 39. DFB EEN, the degrees of freedom between groups, is at it, iv 1 ) A), B) 2 C) 4 D) 6 E) 7 40. MSBEMEEN, the mean squares between gro, s, is than: 33%. . if“... 1, _, ,4“ :1sz A) 12 B) 24 C) 36 CD)» 2 E) 4 ' 41. MSwnHm. the mean squares within groups, is Ms, W{gg,,_,,. ‘_ a W _ _ _- 32.) - : A)12 B)24 C)36 D)72 (fit/)4 '"i 1 “D 4‘ 42. The F ratio obtained from the __ ta above is r. {p - , _' __ A)12 B)16 'C)‘ 8 D) 24 E)72 " i‘ P) 43. The critical value of F in this case is ‘ A) 21.20 B) 30.81 C) 29.46 D) 16.69 E) 13.74 44. You conclude that you _ reject the null hypothesis in this case, because P is _ .01. A can, greater B) cannot, less C) cannot, greater (D) n, less than E) can, equal to NOTE: The data above were obtained from notes found at the campsitem the camp counselors were never seen again! Page 8 FINAL EXAM Practice SOC SC! 108 —l O—INw-P-U'IO’NIMDO O-‘vahmm‘lmtOO-i 1 O 9 8 7 6 5 4 3 2 1 O , O-‘Nw-hU‘IGNWtDO 45. The graphs above show data for random samples of size 8 from a population. Which graph above shows most variation due to error? Which graph shows the most variation that cannot be explained by the independent variable i? A) A B) B C) C D) D 46. Which graph above shows most variation that is due to the, independent variable? Which graph shows the most variation that can}! be explained by the independent variable? (4317A B) B ' C) C D) D 47. Which g‘raph provides the most convincing evidence that there is a relationship between i and X in the population? FAN) B) B C) C D) D ...
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