Unformatted text preview: Unit 2 Seminar
Averages and Variation
MM207: Statistics LEARNING OUTCOMES Find the mode, median, and mean of a data set Find the range, standard deviation, and variance of a data set Understand how percentiles relate a data sample to the population Make a boxandwhisker plot for a data set Section 3.1 # 3 {p. 81}
Upper Canyon: 2 3 1 1 3 4 6 9 3 1 3 Mean: 3.72 First, add all numbers (36). Then, divide by the amount of numbers we have (11) 36 11 3.27 Median: 3 First, put all the numbers in order. Then, find the middle number (or the average of the two middle numbers) Mode: 3 Find the number that is listed the most Section 3.2 # 5 {p. 95}
x: Percentage success for mallard duck nests 56 Range: 72 Largest #  Smallest # (85 13 = 72) 85 52 13 39 Standard Deviation: 26.22 Using the 1st formula Mean: 49 (5649)2 + (8549)2 + (5249)2 + (1349)2 + (3949)2 49 + 1296 + 9 + 1296 + 100 = 2750 2750 (5 1) = 687.5 Sqrt (687.7) = 26.22 Variance: 687.5 (26.22)2 = 687.5 Box and Whisker Plot
Use the numbers below to create a box and whisker plot 31 22 5 9
5 54
5 15
9 10 10
14 3
15 14
22 5
31 54 Numbers in order: 3 Lowest Value: 3 ...
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 Spring '08
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 Statistics, Standard Deviation, Mean

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