hw10 - Section 3.1: #2 #4 #2 With this data the...

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Section 3.1: #2 #4 #2
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With this data the relationship between the age of the lawn mower and its NOx emissions seems somewhat dubious. We certainly do not see any pattern such as positive or negative relationships between the two variables. Thus, we claim that Age is not a particularly useful predictor of NOx emission.
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#4. a. It is seen that both of the BOD mass loading and the BOD mass removal have outliers. BOD mass loading is negatively skewed and BOD mass removal is positively skewed.
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b. Large values of y, which is the BOD mass loading tend to, associated with high value of x, which is the BOD mass removal, a strong positive linear relationship. Furthermore, the two variables appear to be pretty much linearly related, although some points would be spread out about the straight line drawn through the plot. In addition, there are two points that are very far away from the other points, though they are still correlated. Section 3.2: 11, 16, 17 #11 a) Sxy=5530.92-(1950)(47092)/18=339.5867 Sxx=251970-(1950)^2/18=40720 Syy=130.6074-(47.92)^2/18=3.0337
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r=339.5867/((√40720)(√3.0337))=0.9662
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This note was uploaded on 09/21/2011 for the course STAT 350 taught by Professor Staff during the Spring '08 term at Purdue University-West Lafayette.

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hw10 - Section 3.1: #2 #4 #2 With this data the...

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