20110920130740697

20110920130740697 - Wmnm'mwiaummwmmmfiwmwm H... , . ‘ ~...

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Unformatted text preview: Wmnm'mwiaummwmmmfiwmwm H... , . ‘ ~ Part IX Sample Minimum Competency Exams Sample Minimum Competency Exam I Questions 1-10 refer to the following information: The Psychology Department at the University of Dupage uses a questionnaire to evaluate students’ attitudes about teachers. One of the items on this questionnaire was: “Is the teacher entertaining?” The students chose from one of the following alternatives: ‘ w . 1. I was bored the entire semester. 2. I was bored half the semester. ‘3 3. i was not bored, but I was not entertained. W H , W/ , n 4. I was entertained. .th/‘JVA W M- “ WE W U“ 5. I have never seen a teacher with better delivery. ( ' . k. w‘f I 3 )3 i”! The results for Dr. Meade E. Oker were as follows: M ’ I Score 1' ' “'3 of ref av- ” m. ‘ .F ... (3 7t ' . «a 5 2 200 1.09 . h. - _..... Q 10 198 .99 N ‘37.? r, 6H 3“ 146 19g . - .94, W 2 40‘ 48 .24- 1 8 :8 I .04‘~ 1. Does the scale yield ordered or unordered data? WM WA 2. Whatarethereallimitsofaseoreoflt‘? 5 as" rq’q/ . . ., a 3. Are the data drscrete or confinuous. WWW \ M 225 4. Using the set of axes below, sket a_ 1301ng r this frequency distribution. 5. Considering the polygon in item 4, what change(s) c0316. he made m the axes to convey the impression that the students polled had very djflqrent attitudes toward Dr. eade E. Oker? W 226 54$)” 21]. 7/9 [ I (9) Use the set of axes below to construct an ogive for the preceding frequency distribution for Dr. Meade EL. Oker. 6. '. ---/‘lI--- L 3" 4 gwguflfl’ 1 2 Using the ogive sketchéd in item 6, estimate: Q3 3°2~383 1693/ 7. 8. PRP of a score of 2 ! 227 $95,» 2n w ‘ Questions 11—14 refer to the following information: The results for Dr. Oker and another instructor, Dr. Susan Perior, were Plotted as smoothed r® polygons. rf Dr. Perior /. \ ntertaining Not Entertaining “Elite W143“ M a 11-13 Compare these two distributions in terms of shape, location (central tendency), and variability. lgi on F. ._ «u 11. Shape: 12. Location: Ma k at” Q NH 13. Variability: WM Uta/m 14. Why do you think relative frequencies, instead of frequencies, were used in constructing the smoothed polygons comparing Dr. Oker and Dr. Perior? MVWM *$*$*******=31$$$*$*******$****BicHGDieHt31¢******$*$*$******$*3i:*8!31¢*$53link**$*****$*****$***$***#$ 15. The following percentiles were obtained fi'om a distribution of scores for a test in Elementary Statistics: P1 2 10 P25 = 70 P50 : 80 P75 = 85 P99 3 90 Go u; S LS Which of the following best describes the shape of the distribution? (Circle one choice below.) Symmetrical egatively skeweil IQFQL < Qlflca M M cog-wee WW Q}...th C9; (Pi Positively skewed 10 Wagpw m (6) Questions 16—21 are based on the following 5 number - 3,4 5, 8, 10 16. Find E5; Xi2 : ‘5} .4— Hc—i— ZS‘a—LfiH—wu :1" “2|l4} iml ‘ T” M ‘71] (DDW Atom/bf, 17. Findthemedian '5 3?“; 3&3 9‘ (o 18. Findthemeandeviation [3le + |+¢l+iSle + [944+ WT")... B+Z+H 1w z ,2 r M, MB:— 5 5“ '5' m. L 19. mathevafiancej‘; a4» 9} I+‘£+ Ila-‘2 39 CL. 5/ v ELXC‘X)¢'(§,X (m s- 5* 14 The preceding 5 scores were arrived at by subtracting 100 from the IQ scores of 5 students: 20. What was the mean ofthe originalS IQ scores? ,1 Y+ ND 2 + wz-oflwvrlofié Y: 41""? ) Y X Y! MK: (0+100210b 21. What was the variance ofthe original 5 IQ scores? c. 2 1 S L __ Z SIX-1.5191ch \g‘f 1?? Y'Hoou Yak? *1:***$***=§=$$$*=§=$Dink?!ch$060k$>§¢=§=>k***>!s5kfinial:=k*****iambic*5!€*******3416*1‘*3“):=5:$****$*X¢*$**$*********$* Questions ~ ‘2 ‘4 n = e based on a distribution of scores that have a ' d a standard F 1‘;- deviation - M "‘ eev 22. What is Alice’s zoscore if her test score is 1'8? 2_ r;_ [g/P )SMH 3 A L 5/ r I III— ,» # Z “i Yfl S 23. Ifthe instructor transforms the scores to have a mean of 100 and standard devia the transformed vaiue of someone with a score of i3? ' a. 2 3— :5“; M3; :2 T x "TagoOIBJ-W‘ig‘? 1:. Mi , " 24. The original scores are skeived to the fight. What is the shape ofthe distribution ofthc Y satires, where Y:- —' 7 . ' ‘ 20?: I 15)+100, _ e Juncmr M Q 2 a [5% a 344' V3302+wo 25. What would be the effect on the median of a distribution of 10 scores if only the largest score was increased by 5 points? (Circle one choice below) 26. What would be the effect on the mean if the largest score was increased by z X H ' n of 20, what would be Increase Decrease M 5 points? (Circle one choice below) Increase Decrease Remain the same r“ 229 E X + 5 3 M W W h ...
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