1.A histogram of data with a long left tail indicates that the data, a. has a ne
ID: 3317386 • Letter: 1
Question
1.A histogram of data with a long left tail indicates that the data, a. has a negative average. b. has a Q3 greater than its median. c. has an average less than its median d. has a Q3 less than its mean e. satisfies both (b) and (c). You have been involved in a study of SAT score. When you received your score, it place you in the 74th percentile. According to the results of this study you can conclude, if the distribution of the SAT score is symmetric a. your SAT score was higher than the Q3 of the study b, approximately 26% of those taking the test scored lower than you. c. your score was higher than the Q1 of the study d. all of the above. 2. e. none of the above. 3. The correlation coefficient a. implies causation when its value is close to 1 or -1. b, always lies between 0 and i . c. measures all kinds of association in a scatter plot. d. does not change if we change the unit of one variable. e. satisfies all of the above. 4. The event A has a 30% chance of happening. The event B has a 40% chance of happening. If the chance that both events happen together is 12%, then the two events are disjoint. If the chance that at least one event happens is 70%, then the two events are independent. If the chance that both events happen together is 12%, then the two events are dependent. If the chance that at least one event happens is 70%, then the two events are disjoint. none of the above a. b. c. d. e. 5. If the correlation coefficient between two variables is -0.043, then a. the scatter plot of the two variables may still show some pattern. b. there is no strong linear association between the two variables. c. there is a weak linear association between the two variables. d. All of the above are true. e. None of the above is true.Explanation / Answer
1) e.Satisfies both (b) and (c)
2) c. Your score was higher than the Q1 of the study
3) d. does not change if we change the unit of one variable
4) d. If the chance that at least one event happens is 70%, then the two events are disjoint
5) d. All the above are true
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