Stat_Chapter 3 Key Words

116 5 15 16 20 21 25 26 27 30 30 31 32 32 34 35 38 38

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Unformatted text preview: Skewed (tail to left) Quartiles – TV viewing times in hours n = 20 See p. 116 5 15 16 20 21 25 26 27 30 30 31 32 32 34 35 38 38 41 43 66 – median is 30.5 Sort in order from descending to ascending (even – average the two points in the middle for the median; for odd select the middle point or median which is the second quartile). 5 15 16 20 21 25 26 27 30 30 - 1st quartile median is 23 31 32 32 34 35 38 38 41 43 66 – 2nd quartile median is 36.5 Interpretation: 25% of the TV viewing times < 23 hours; 25% are between 23 hrs and 30.5 hrs; 25% are between 30. 5 hours and 36.5 hours; and 25% are greater than 36.5 hours. Interquartile Range: Difference between the first and third quartiles. IQR=Q3-Q1 for TV viewing times = 36.5 -23 = 13.5 hours Interpretation: The middle 50% of the TV-viewing times are spread out or have a range of 13.5 hour interval, approximately. 4 Five Number Summary – Number value for min and max and each quartile. Example using TV viewing Times Min = 5...
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This document was uploaded on 02/06/2014.

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