HW1 - 13 b ∑x 2 = 4 2 2 2 6 2 1 2 = 57 c(∑x 2 =(13 2 =...

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Homework 1 Chapter 1: 7, 10, 18, 19, 20 7. Independent variable: aspirin Dependent variable: heart attack 10. a. dependent variable: number of colds b. Discrete (you cannot have 1.5 or 1.666666 colds, therefore it is not continuous) c. Ratio (having zero colds means the absence of the event, and there is an equal distance between values) 18. a. ∑x = 4+2+6+1 =
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Unformatted text preview: 13 b. ∑x 2 = 4 2 + 2 2 + 6 2 + 1 2 = 57 c. (∑x) 2 = (13) 2 = 169 d. ∑(x-1) = (4-1) + (2-1) + (6-1) + (1-1) = 3+5+1+0 = 9 19. a. ∑x = 3+4+2+6 = 15 b. ∑y = 2+1+3+4 = 10 c. ∑xy = (3*2) + (4*1) + (2*3) + (6*4) = 6+4+6+24 = 40 20. a. ∑x + 3 or (∑x) + 3 b. ∑(x - 2) 2 c. ∑x 2- 10 or (∑x 2 ) - 10...
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