quiz_1_3feb2010_solution - Row Mean Median Q3 IQR a 32.9...

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Name: Statistics 100 Quiz 1 Wednesday 3 February 2010 The histogram below shows the distribution of infant mortality rates (deaths per 1,000 live births) in a selection of countries around the world. 0 10 20 30 40 Percent 0 50 50 100 100 150 150 200 200 inf_mortality inf_mortality 1. Is this distribution symmetric, left-skewed or right-skewed? You do not need to justify your answer. right-skewed 2. The table below gives three sets of potential summary statistics for these data. Which row best matches the distribution above? Give the reason for each of the two rows that you eliminate.
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Unformatted text preview: Row Mean Median Q3 IQR a 32.9 19.6 51.8 10.2 b 32.9 19.6 51.8 44.1 c 40.4 49.2 51.8 52.4 Row c is eliminated because the median is larger than the mean; the reverse is true in right-skewed data. Row a is eliminated because the IQR is too small. The value given is less than the distance between Q3 and the median, and the IQR is the distance between Q3 and Q1, which is smaller than the median. Row b is the correct answer Page 1 of 1...
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This note was uploaded on 03/14/2012 for the course STATS 100 taught by Professor Grandal during the Spring '11 term at Harvard.

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