HW2_Problems

# HW2_Problems - Exercises for Section 2.1 6 In a laboratory...

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Exercises for Section 2.1 6. In a laboratory test of a new engine design, the emissions rate (in mg/s of oxides of nitrogen, NO X ) was measured as a function of engine speed (in rpm). The 8 results are presented in the following table. Speed 1671. 8 1532. 8 1595. 6 1487. 5 1432. 3 1622. 2 1577. 7 Emissio ns 323.3 94.6 149.6 60.5 26.3 158.7 106.0 a. Compute the correlation coefficient between emissions and speed. b. Construct a scatterplot for these data. c. Is the correlation coefficient an appropriate summary for these data? Explain why or why not. 8. Another chemical engineer is studying the same process as in Exercise 7 and uses the following experimental matrix. Temperature ( O C) Stirring Rate (rpm) Yield (%) 110 30 70.27 110 40 74.95 110 50 77.91 110 60 82.69 121 30 73.43 121 40 73.14 121 50 78.27 121 60 74.89 132 30 69.07 132 40 70.83 132 50 79.18 132 60 78.10 143 30 73.71 143 40 77.70 143 50 74.31 143 60 80.99 a. Compute the correlation between temperature and yield, between stirring rate and yield, and between temperature and

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• Fall '10
• Zhai
• Harshad number, Self number, Pearson product-moment correlation coefficient, Journal of Coal Quality, percent ash

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HW2_Problems - Exercises for Section 2.1 6 In a laboratory...

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