STA 225 Quiz: STA 225 Oakland STA 225 Quiz II Fall 2003 Hamilton
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A 1 1 work is to be your own. Be neat and organized, and use correct notation: the following data involve census data. For the 14 michigan counties with the highest rate of phoneless homes, the data represent x, the poverty rate (as a percentage) and y, the percentage of households without a phone. S o w facts : cx = 184. 5 , cx2 = 2555. 33 , cy = 68. 9 , Z y 2 = 350. 71 , cxy = 925. 86 , n = 14 , s, = 3. 087 , s, = . C. r) a) draw a scatterplot of these data (ignore the 2 missing points) . i. Cs) d) compute the value of the correlation coefficient. Describe the nature of the relationship between x and y. (5) e) determine the equation of the least squares regression equa- tion, showing your work.
