1. Which of the following is true? a) Ds= Ps = Q5 b) Dso = Ps = Q25 c) Ds= P50 = Q2 d) Dso = Ps = Q2 Answer= 2. On an easy test, the mean test score is greater than median test score. The distribution of the test scores is likely to be a) Symmetric b) Negatively skewed c) Positively skewed d) Normal Answer= 3. Normal rule states that the approximate percentage of measurements in a data set that fall within one standard deviation of their mean is: a) 68% b) 95% c) 99.7% d) none of these. Answer=

15. Research results suggest that IQ scores for boys Plomin, 2006). A typical study looking at 10-year-old are more variable than IQ scores for girls (Arden & size would be reported in a journal article. children classifies participants by gender and by low. average, or high IQ. Following are representing the research results. Do the data indicate a significant difference between the frequency distri- butions for males and females? Test at the .05 level of significance and describe the difference. hypothetical data 1 IQ Low Average High Вoys 18 42 20 80 Girls 12 54 14 80 n = 160 Int Ava

With a topic of z-scores, Which score indicates the highest relative position? A) A score of 2.6 on a test with mean=5.0 and s=1.6 B) A score of 650 on a test with mean=800 and s=200 C) A score of 48 on a test with mean=57 and s=6 D) A score of 16 on a test with mean=18 and s=1.5

1. In a distribution of six scores, the deviations from the mean for five of the scores are +5, +3, +1, 0, and-3.What is the value of the deviation for the sixth score?   2. On the midterm exam in their anthropology course, Jan’s deviation score was +5, Kim’s was -12, andLeslie’s was 0.a) of these three, who did the best and who did the worst?b) the mean for the class was 80. What was the raw score for Jan, Kim, and Leslie?