oldexam1

# oldexam1 - Exam#1 Form A Statistics 211(Spring 2001 This...

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Chapter 1 [1] A data set of 10000 observations has a median of 8. If a constant of 2 is added to every observation what would the median of this new data set be? a) 6 b) 8 c) 10 d) 1000 e) We need to know the actual data to answer this question. [2] The ﬁrst four deviations from the mean in a sample of n = 5 reaction times were 0 . 0 , 0 . 2 , 0 . 8 , 1 . 0, what is the ﬁfth deviation from the mean? a) -2.0 b) 0.0 c) 1.0 since this is not a trimmed mean. d) 2.0 e) We need to know the actual data to answer this question. [3] The mode of a data set is: a) is use to calculate the fourth spread . b) is undeﬁned if Q 3 - Q 1 is greater than 1. c) the least frequent observation in the data set. d) is always between the mean or median of the data set. e) the observation that occurs most frequently. [4] The “box” portion of a boxplot contains approximately what percent of the data? a) 25% b) 50% c) 75% d) 95% e) It varies — it depends on the actual data set [5] For a perfectly symmetric distribution how would the trimmed mean and mean relate? a) mean < trimmed mean b) mean > trimmed mean c) mean = trimmed mean d) mean 6 = trimmed mean e) The relationship is unknown. It could be any of the above. [6]
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oldexam1 - Exam#1 Form A Statistics 211(Spring 2001 This...

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