STA3032 Quiz 10

# STA3032 Quiz 10 - Source DF SS MS F P Regression 2763.7...

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NAME (in CAPITALS): UFID Section: 7370 / 7393 UNIVERSITY OF FLORIDA DEPARTMENT OF STATISTICS STA3032 QUIZ 10 Spring 2011 Problem 8 on page 537 (Changed a lot) The following table presents shear strength (in kN/mm) and weld diameters (in mm) for a sample of spot welds: Diameter 4.2 4.4 4.6 4.8 5.0 5.2 5.4 5.6 5.8 6.0 Strength 51 54 69 81 75 79 89 101 98 102 1. A scatter diagram of the sample data is given below. What can you say about the relation between the two variables? 6.0 5.5 5.0 4.5 4.0 100 90 80 70 60 50 Diameter Strength Scatterplot of Strength vs Diameter PTO for more questions on the back.

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2. The sample data yielded the following ANOVA table. Fill the empty cells in the table. Analysis of Variance
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Unformatted text preview: Source DF SS MS F P Regression 2763.7 0.000 Residual(Error)--Total 2994.9---3. Use the following output to test Ho: β = 0 vs. Ha: β ≠ 0. What is the conclusion of the test? Predictor Coef SE Coef T P Constant -67.69 15.19 -4.46 0.002 Diameter 28.939 2.959 9.78 0.000 4. Write the prediction equation using the above output. 5. What does the plot of standardized residuals vs. the predictor, given in the following graph, tell you in the context of this problem? 6.0 5.5 5.0 4.5 4.0 2.0 1.5 1.0 0.5 0.0-0.5-1.0 Diameter Standardized Residual Residuals Versus Diameter (response is Strength)...
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STA3032 Quiz 10 - Source DF SS MS F P Regression 2763.7...

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