STAT_10_F2011_Review_Session_Exam_II_short-1

# STAT_10_F2011_Review_Session_Exam_II_short-1 - Which is...

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Which is true of the data shown in the histogram? I) The distribution is skewed to the right. II) The mean is smaller than the median. III) We should use the median and IQR to summarize these data. 1 2 3 4 5 2% 17% 7% 56% 17% 1. I only 2. II only 3. III only 4. II and III only 5. I, II, and III

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Which of the following are measures of the center of a distribution (circle all that apply): I. Mean II. Variance III. Standard deviation IV. Median 0% 80% 20% 1 2 3 4 A. I only B. III only C. I and IV D. IV only
Which of the following are measures of the spread of a distribution (circle all that apply): I. Mean II. Variance III. Standard deviation IV. Median 2% 0% 13% 85% 1 2 3 4 A. II only B. III only C. I and IV D. II and III

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Which of the following is not part of the 5-number summary: 2% 18% 78% 2% A.The minimum and maximum B. The mean C. The median D. The quartiles: Q1 and Q3
Which of the following data summaries are changed by adding a constant to each data value? I ) the mean II) the median III) the standard deviation A. B. C. D. E. 24% 3% 15% 9% 50% A. I only B. III only C. I and II D. I and III E. I, II, and III

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A hidden variable that stands behind a relationship and determines it by simultaneously affecting the other two variables is called a ______ variable. 1 2 3 4 96% 0% 2% 2% 1. lurking 2. causal 3. response 4. predictor
A residuals plot is useful because I. It will help us to see whether a linear model makes sense. II. It might show a pattern in the data that was hard to see in the original scatterplot. 1 2 3 4 18% 0% 76% 7% 1. I only 2. II only 3. I and II 4. Neither I nor II

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A correlation of zero between two quantitative variables means that 8 1 2 3 4 0% 0% 91% 9% 1. we have done something wrong in our calculation of r . 2. there is no association between the two variables. 3. there is no linear association between the two variables. 4. re-expressing the data will guarantee a linear association between the two variables.
though the correlation is probably near zero? 9

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## This note was uploaded on 04/09/2012 for the course STATS 10 taught by Professor Ioudina during the Winter '08 term at UCLA.

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STAT_10_F2011_Review_Session_Exam_II_short-1 - Which is...

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