AS1101 Probability & Statistics [CT3a], May 2013: SolutionsAS1101/MA1615 May 2013: Short answersQuestion 1(i) A{M: quartiles are 38, 54, 70; no outliers.N{Z: quartiles are 43, 46, 47; definite outliers are 69, 65, 25; no possible outliers(although 37 is right on the fence).(ii) Box-and-whisker plot: should ensure that outliers are treated appropriately and use asingle horizontal axis.(iii) Locatio
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AS1101 Probability & Statistics [CT3a], May 2013: Solutions
AS1101/MA1615 May 2013: Short answers
Question 1
(i) A{M: quartiles are 38, 54, 70; no outliers.
N{Z: quartiles are 43, 46, 47; definite outliers are 69, 65, 25; no possible outliers
(although 37 is right on the fence).
(ii) Box-and-whisker plot: should ensure that outliers are treated appropriately and use a
single horizontal axis.
(iii) Location: A{M scores generally higher looking at S-and-L plot: UQ and Median rather
higher, though LQ is lower.
Spread: N{Z very compressed, with much smaller IQR and smaller range than A{M.
Skewness: A{M roughly symmetric, based on quartiles, though diagram appears to
show some right skew.
N{Z also fairly symmetric, though quartiles suggest left skew.
(iv) The friend is confusing correlation with causation.
Question 2
(i) The Venn diagram should demonstrate that W
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