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Stat_100_assignment_3_soln - Question 10.4 Sum of...

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Unformatted text preview: Question 10.4 Sum of amounts: 504.9+16.7+ … + 0.1 = 816.3 The difference in the totals is likely due to round off error. Question 10.6 This is a bad plot. The width of the “bars” is changing along with the height. This makes the areas of the “bars” change by more than the actual differences in the interest rates. Question 10.10 a. 19.8% plan to major in something else (“Other”) b. (Note, some students will not put ”Other” on the plot. Do not take off marks. Plot should be clearly labeled. Give half marks for using a pie chart. Exercise 10.10: Majors of Freshmen Other SocialSci Professional Eng&Sci Education Business Arts&Hum 0 5 10 15 20 25 Question 10.12 a. Note: Plot should be clearly labeled c. (i) The number of civil disturbances is declining over the time period. (ii) Also, there are more disturbances in Spring and Summer than in Fall and Winter. (iii) This is probably weather related (demonstrating is less unpleasant in good weather). Other answers are possible for (iii) Exercise 10.12: Civil Disturbances Number of Disturbances 50 40 30 20 10 0 Time Period Question 10.14 Spacing X ­axis on graph is not consistent. Question 10.22 a. Bar chart of percent of sales by manufacturer The advantage of a bar ­chart is that one can easily see the relative size of the sales by manufacturer, without looking directly at the data. Question 11.6 (do not mark) a. Overall shape of the histogram is bell ­shaped. b. The center (median) appears to be around 10 ­20%. The data ranges from about  ­70 to 110%. c. About 25% of stocks lost money. Question 11.12 (do not mark) (i) sketch a skewed left distribution with x ­axis as year and y ­axis as the percent of observations in each year (or bins of years). Would be skewed left because older coins are taken out of circulation and recycled (thus there are fewer of them). In addition, there will be occurances of some old coins. Furthermore, there will be mostly recent coins, but obviously none from the future, thus contributing to the skewness. ...
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