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STAT 1124 Assignment 5 Model Answers

# STAT 1124 Assignment 5 Model Answers - STAT 1124 Section 2...

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STAT 1124 – Section 2 Assignment 5 Due Wednesday, March 4, 2009 Model Answers You can complete these questions by using Excel or Statgraphics. 1. Question 5.26, Page 140. Using Excel, we obtain the following scatterplot: Exercise 5.26 Page 140 y = 0.527x + 27.635 R 2 = 0.3114 58 60 62 64 66 68 70 64 65 66 67 68 69 70 71 72 73 74 Brother's Height Siste's Height a. The correlation coefficient r = square root of 0.3114 and is positive. It is equal to 0.558 The Least-square regression is y = 27.64 + 0.527x b. Tonya height = 27.64 + 0.527*70 = 64.53 inches

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2. Question 5.40, Page 145. Using Excel, we obtain the following scatterplot: Exercise 5.40, Page 145 y = 11.894x - 1.2861 R 2 = 0.8391 0 10 20 30 40 50 60 70 0123456 Stemps Larvae r = square root of 0.8391 and is positive = 0.916. The decision point to test whether there is a statistically significant relationship between the stumps and beetle larvae is 0.413. Since r > 0.413, we can conclude that there is a statistically significant relationship between the stumps and beetle larvae. We can say that the data support the “beavers benefits beetles” idea.
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STAT 1124 Assignment 5 Model Answers - STAT 1124 Section 2...

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