STAT 2000 Lecture 6: January 25
23 Feb 2017
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Example: heights of men: height cutoff for short men, 1. Is a male with a height of 78 inches an outlier: (cid:1876) = 70 inches standard deviation=2. 8. (cid:1878) (cid:1871)(cid:1855)(cid:1870)=(cid:3123)(cid:3124) (cid:3123)02. (cid:3124) = 2. 857 does not exceed 3 so it is not an outlier. (cid:1876) +3s=78. 4 inches: can compare 78 to 78. 8 raw data = inches, can compare 2. 857 to 3 n z-score= no units. So, any man whose height is less than 61. 6 would be an outlier: height cutoff for tall men. Response variable: explained/determined by another variable: when data is quantitative, response variable goes on y-axis. Explanatory variable: explains or affects response variable: when data is quantitative, explanatory variable goes on x-axis. Association: relationship of two variables with each other. Scatterplot: when you think two quantitative variables may be related: used to determine shape (approximately linear or not, direction used to determine trend (positive, negative, or flat)
