3022HW1 - Solutions to Homework 1 Problem 1.17 1 The total...

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Solutions to Homework 1 January 21, 2010 Problem 1.17 1. The total number of people who responded to the survey is 232. 1-18 10 232 4.3% 19-24 97 232 41.8% 25-35 70 232 30.1% 36-50 36 232 15.5% 51-69 14 232 6.0% 70 and Over 5 232 2.2% 2. > X<-c(4.3,41.8,30.1,15.5,6.0,2.2) > barplot(X,xlab="Age Group",ylab="Percent") Age Group Percent 0 10 20 30 40 3. The distribution is unimodal and skewed to the right. 1
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4. Histograms must have equal size ”bins”, in this case the groups must have the same width Problem 1.21 1. Alaska is 5.7%, and Flordia is 17.6%. 2. The distribution is roughly symmetric or can be considered slightly skewed left, centered near 13%. Ignoring the outliers, the percentages are spread
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Unformatted text preview: from 8.5% to 15.6%. Problem 1.26 The distribution is skewed to the right, meaning that Skahkespeare’s plays contain more short words than long words. We would probably expect most authors to hold the same trend. Problem 1.37 Graph (a) is studytime, you can expect most people to study very little, which would cause the skew to the right. Graph (d) is the student heights, which has more variation but has no skew. Graph (b) is the graph about handedness, which we would expect because of pervious studies on the subject. Which leaves graph (c) to the the gender graph. 2...
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