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Unformatted text preview: STAT 1000 Assignment 2 DUE: February 8th (Wed. Eve. Section), February 9th (T/Th. Sections), February 10th (MWF. Sections) SHOW ALL YOUR WORK 1. [5] Consider the following 10 data points: x 3 5 6 4 3 7 6 5 4 7 y 4 3 2 1 2 3 3 5 4 2 (a) Plot the above observations on a scatterplot. (b) Calculate the correlation coefficient, r ( by hand ). What does this value tell us? (c) Calculate the least squares regression line. 2. [11] A foodsandnutrition investigator would like to know if the amount of sodium (g) can be predicted by the amount of sugar (g) in the following sample of 12 popular breakfast cereals. Cereal Sugar (g) Sodium (g) Mini Wheats 7 AllBran 5 0.26 Apple Jacks 14 0.13 Captain Crunch 12 0.22 Cheerios 1 0.29 Cinnamon Toast Crunch 13 0.21 Corn Flakes 2 0.29 Raisin Bran 12 0.21 Oat Bran 10 0.14 Crispix 3 0.22 Frosted Flakes 11 0.20 Fruit Loops 13 0.13 (a) Identify the response and explanatory variables. (b) Use JMP to produce a scatterplot and highlight the least squares regression line on the output. (c) Interpret the slope of the least squares regression line in the context of this question....
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This note was uploaded on 04/01/2012 for the course STAT 1000 taught by Professor Xu during the Spring '12 term at Manitoba.
 Spring '12
 XU

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