exam2a-answerkey - PSC 41 Fall 2007 Exam 2 FORM A Name ID...

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1 PSC 41 – Fall 2007 Name Exam 2 - FORM A ID# Instructions: There are 45 multiple-choice questions. Read each question and the possible answer choices carefully . Choose the single BEST response for each item. Fill in the appropriate bubble on your UCD2000 scantron answer sheet with a No.2 pencil. 1. To obtain the variance, which = ( Σ (x - x) 2 /(N-1), the a. sum of squared deviations is divided by the degrees of freedom. b. sum of squared deviations is divided by the number of scores. c. standard deviation is divided by the degrees of freedom. d. standard deviation is divided by the number of scores. 2. A researcher needs to pick five people of differing IQ levels. Their IQs must add up to 550, the first must be 95 and the third must be 140. The number of degrees of freedom would be a. 5 b. 4 c. 3 d. 2 3. If a perfect positive relationship between two variables exists, as one variable a. increases, the other variable will increase by a predictable amount. b. decreases, the other variable will decrease by a predictable amount. c. increases, the other variable will decrease by a predictable amount. d. both A and B 4. A researcher wants to measure the relationship between age and score (two continuous variables) on this test. The most appropriate statistic would be the a. Spearman rank-order correlation. b. sign test. c. Pearson product-moment correlation. d. repeated measures ANOVA. 5. A researcher found that short people did well in research methods and tall people did poorly, with people of average height scoring in the middle. The relationship between height and grade in research methods is a a. positive correlation. b. negative correlation. c. nonlinear relationship. d. curvilinear relationship. 6. If you wanted to quantify the degree of relationship between academic achievement and creativity, which correlation coefficient would you want to use? a. Pearson product-moment correlation b. Spearman rank-order correlation c. Either would be appropriate. d. It would depend on how the variables were measured.

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2 7. Which correlation represents the strongest relationship? a. +.37 b. +.68 c. -.02 d. -.73 8. The Pearson product-moment correlation is an index of what type of relationship between two variables? a. circular b. linear c. parabolic d. curvilinear 9. From left to right, the above distributions are a. vertically skewed, skewed right, skewed left. b. symmetrical, negatively skewed, positively skewed. c. vertically skewed, positively skewed, negatively skewed. d.
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exam2a-answerkey - PSC 41 Fall 2007 Exam 2 FORM A Name ID...

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