AMS310 Summer2011 hw1-ch2 solutions

# AMS310 Summer2011 hw1-ch2 solutions - + 30 40 50 60 70 80...

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Homework 1 (Chapter 2) Due Friday, June 03 1. The following is the examination scores of 15 students. 75 98 42 75 84 87 65 59 63 86 78 37 99 66 90 (a) make a stem and leaf plot. (b) make a dot diagram. 2. Motor octane ratings for various gasoline blends: 88.5 87.7 83.4 86.7 87.5 91.5 88.6 95.6 93.3 94.7 87.8 89.9 91.1 91.0 94.2 (a) make a stem and leaf plot. (b) make a dot diagram. 100 90 80 70 60 50 40 30 - - + - - - - + - - - - + - - - - + - - - - + - - - - + - - - - + - - - - + - -

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3. Humidity readings (rounded to the nearest %): 29 44 12 53 21 34 39 25 48 23 17 24 27 32 34 15 42 21 28 37 (a) make a frequency distribution table. Class Interval Tally Frequency Rel. Freq. 10-19 ||| 3 3/20=.15 20-29 |||| ||| 8 8/20=.40 30-39 |||| 5 5/20=.25 40-49 ||| 3 3/20=.15 50-59 | 1 1/20=.05 Total 20 1.00 (b) make a histogram.
This is a density histogram with total are equal to 1. You could also make it with just the frequency or rel.(%) frequency on the top of each bar.

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## This note was uploaded on 09/14/2011 for the course AMS 310 taught by Professor Mendell during the Summer '08 term at SUNY Stony Brook.

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AMS310 Summer2011 hw1-ch2 solutions - + 30 40 50 60 70 80...

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