# stat ch 10 - y=0.8565+0.40248x b) ~ 40.25 kcal/24 hr. c)...

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Serenity Witten MATH 200 Ch. 10 hwk !0.1 (10) a) No. The two have no correlation to each other so an increase in people living longer will not cause a decrease in infant mortalities. b) A lurking variable might be that there is better healthcare and the prenatal treatments have improved. 10.1 (12) a) y = -0.2741x + 37 R 2 = 0.8937 0 5 10 15 20 25 30 35 40 45 0 20 40 60 80 Series1 Linear (Series1) b) The correlation is moderately negative. c) ε x=135 ε x 2 =7133 ε y=148 ε y 2 =4674 ε xy=3040 r=-0.9454 As x increases, y decreases because the slope (r) is negative. 10.2 (6) a) y=a+bx

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Unformatted text preview: y=0.8565+0.40248x b) ~ 40.25 kcal/24 hr. c) r=0.984 10.2 (14) a) y = 0.1163x - 3.2301 R 2 = 0.0056-8-6-4-2 2 4 6 5 10 15 Series1 Linear (Series1) b) x=44.7 x 2 =315.85 y= -17.4 y 2 =116.1 xy= -107.18 r=0.084 c) x=6.3857 y= -2.4857 a= -3.311 b= 0.129 y=a + bx y= -3.311 + 0.129x e) r 2 = .007056 0.71% of variation explained, 99.29% unexplained f) It does not make sense to use the least squares line for the prediction because the correlation between the variables is so low....
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## This note was uploaded on 11/08/2010 for the course STAT 301 taught by Professor Staff during the Spring '08 term at Purdue University-West Lafayette.

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stat ch 10 - y=0.8565+0.40248x b) ~ 40.25 kcal/24 hr. c)...

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