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20110920130730404

# 20110920130730404 - Review Exercises for Exam I 1 13 Wibrwn...

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Unformatted text preview: Review Exercises for Exam I 1. 13. Wibrwn Elementary Statistics In comparing two or more graphs plotted on the same axis, the relative frequency poiygon is more usefui than the histogram?®or F The histogram is definitely superior to the frequency polygon for presenting data for nominal scaies®3r F in constructing figures and graphs, the zero points should always appear even though it may sometimes require the use of “break marks” in the axis®3r F The same figure should never be used to represent both a frequency polygon and a percentage polygon. T [email protected] Nominal measurements ten d to be iower in vaiidity than ordinal measurements. T [email protected] Nominal scaies represent quantitative differences. T [email protected] A ratio scale measurement is also an intervai scaie [email protected] F The number of seconds taken to compiete a task is measured on a ratio scaieﬂor F A reported vaiue of 9.83 seconds has the reai iimits 9.825 and [email protected] F A measure of behavior may have iow reliabiiity and high vaiidity. T 0rd? . When you determine a score from a percentiie, you are finding a percentile rank. T or® . A reiative frequency distribution shows the proportion of total scores which fali within a class intervai.(‘Dor F The cumuiative frequency distribution ShOWS the number of cases that fall below the lower real limit of an interval. T 063 14. Muitipie Choice Questions Questions 16 concern the following frequency table. Score : Frequency: 2 6 7 11 6 3 2 1. 2. 3. 9101112131415 ; i1 22+p+7+u+c+3+l= 3’7 For these data N=_3_7 a. 7 b. 84 © 37 Cl. 11 The cumulative frequency for 12 is @925 Cr: 1+s+7w b. 11 c. 42 d. 22 The proportion of scores associated with a score of 13 is a. 6 b. -29? \r‘l: £0.» ;, lg c. .865 3’7 d. .162 W w, 74” 4. The cumuiative proportion associated with a score of 13 is 21:97 (at: 2+e+7+n+i :32, c.:865 (26/011 2,1136}; 7963.“) on of \$2943 a. .162 37 S. The real limits of the interval containing the median is a. 11»13 (69115-125 c. 2-3 d. 1.5-2.5 6. The shape of the distribution of scores wouid be described as a. Positively skewed Symmetrical and belt shaped c. Bimodai d. Negativeiy skewed 7. Students are asked to press a button as quickly as possible after a signal light is turned on. This Exercise is carried out 500 times for each student. The distribution oftheir reaction times is Likeiy to be Symmetrical and unimodal b. Positively skewed c. Symmetrical and bimodal d. Negatively skewed 8. Mary’s percentiie rank on a math exam was 80 while Sue’s percentiie rank was 40 on the same Exam. We may say, therefore, that W gr gm, a. Mary answered twice as many items as Sue did b. Mary’s math achievement is double that of Sue's c. Sue scored as well or better than 40 members of this group None of the above 9. In a negatively skewed distribution, the proportion of cases between Q1 and the median is @25 b. greater than .25 c. less than .25 xactly —.25 ® 250 Use the figure below to answer questions 10-15 m 150 109 YEARLY PERCENT 50 30 NEVER is 10-19 20—35} 4' SMOKED ﬂEGULARLY NUME‘ER 0F CIGARETTes SMOKED A DAY YEARLY DEATH RATE FRO M LUNG CANCER PER 100.000 ADULYS Sop/t “3M” 10. The death rate for adults smoking 40 or more cégarettes per day is roughiy 20 times greater than for adults who never smoked regularly @r F 11. Of adults who smoke 40 or more cigarettes per day, 2% die each year T OEF) 12. The annual death rate for light smokers (iess than 10 cigarettes per day) is 5 times greater than for Persons who never smoked regularly, but one 25% as great for very heavy smokers (40+ cigarettes per day @or F 13. The death rate for the 1-9 cigarette—per-day group is 500% times than of the never—smoked group; The neVer-smoked group has a death rate that is 20% that of the 1-9 cigartetteswper—day group®r F 14. From this figure, we can determine that the death rate for the entire population of adults would be Between 90 and 150 per 100,000 T or® 15.Point A a the right—hand vertical axis) corresponds to which value in a percentage poiygon? . (2.1% d. 10% d. none ofthese @ ...
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20110920130730404 - Review Exercises for Exam I 1 13 Wibrwn...

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