8. The20 p-graders have a mean test score of 109 and th-30y,\'denhves meanttia\"

Question

8. The20 p-graders have a mean test score of 109 and th-30y,'denhves meanttia" d 200, What is the mean test score for the 2 samples A. 200 B. 180 17s D. 150 9. from the population, what is the value for the new mean? Apopulation of N-7scores has a mean ofm.no.?0ne score 1 66/6 11 a Cannot be determined from the information given what is the value of the median for the following set of scores? Scores: ya 25 26 tu,** 8, 12, 7 12.5 11. Under what circumstances is the median likely to produce a better measure of than the mean? central tendency With a symmetrical distribution With an extremely skewed distribution When the data consist of nominal measurements When the data are numerical scores from an interval or a ratio scale d. 12. A population of N 6 scores has x -12 and 2x2- 54. What is the value of SS for this population? 30 54 d. 13. What is the variance for the following population of scores? Scores: 5,2.5.4 , 4 a. 6 C1.5 o (5-42 2 d. 1.22 14, A population has ? 50 and ?-5. If 10 points are added to every score in the population, what a the new values for the mean and standard deviation? 15 ?-60 and ? ?? 50 and ?-15 Bonus Questions worth 3 points each attitude scores for males and females, participant ge 15. For a research study comparing example of what kind of variable? dependent variableA quas-independent variable A quasi-dependent variable b. A dependent variable d.

Explanation / Answer

8) combined mean = (n1m1*n2m2)/(n1+n2)

={ (20*150)+(30*200) }/(20+30)

= 180

9) can't be determined

10) median = mean of two middle values

Median = (8+12)/2 = 10

11) with an extremely skewed distribution

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