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quiz4_09

# quiz4_09 - Abel Rodriguez Applied Mathematics and...

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Abel Rodriguez Applied Mathematics and Statistics AMS-007. Spring 2009 Name: Quiz 4 1. ( 50 points) Listed below are heights (in inches) and weights (in pounds) for nine super models. x Height (in) 71.0 70.5 71.0 72.0 70.0 70.0 66.5 70.0 71.0 y Weight (lb) 125 119 128 128 119 127 105 123 115 Note that i x i = 632, i x 2 i = 44399, i y i = 1089, i y 2 i = 132223 and i x i y i = 76546. a ) ( 25 points) Is there evidence that weight and height are associated? Use a signiﬁcance level of 0.1. b ) ( 30 points) What would be your best prediction, and the corresponding 95 % prediction interval, for the weight of a model whose height is 68 inches.

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