STAT 1124 Assignment 4 Model Answers

# STAT 1124 Assignment 4 Model Answers - STAT 1124 Section 2...

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STAT 1124 – Section 2 Assignment 4 Due Tuesday, February 24, 2009 All questions for this assignment are from the text. 1. Question 4.24, Page 108. You must calculate the correlation by hand. Use the Decision Table for correlation in the supplement to answer b) a. Question 4.24 Page 108 64 65 66 67 68 69 70 71 72 73 63 64 65 66 67 68 69 70 71 Men Women We expect to the correlation to be positive and is not very large (not near +1 or - 1.) b. Women Men X Y x-xbar y-yBar (x-xbar)/s x (y-ybar)/s y ((x-xbar)/s x )*( (y-yBar)/s y ) 66 72 0 3 0.000 1.186 0.000 64 68 2 1 0.953 0.395 0.377 66 70 0 1 0.000 0.395 0.000 65 68 1 1 0.477 0.395 0.188 70 71 4 2 1.907 0.791 1.508 65 65 1 4 0.477 1.581 0.754 Sum 396 414 2.827 Number 6 6 Mean 66 69 0.565 St. Dev. 2.098 2.530 Correlation Coefficient =

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From the table, the decision point is 0.811. Therefore, we can not conclude from the data that taller women tend to data taller men. You can complete 2,3, and 4 below either by hand, using Excel, or using Statgraphics. 2. Question 4.28 (a), (b), and (c), Page 110. Also use the Decision Table for correlation to decide whether there is a statistically significant linear relationship.
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STAT 1124 Assignment 4 Model Answers - STAT 1124 Section 2...

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