4th Edition

ISBN: 9781260133295

Author: Navidi

Publisher: MCG

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Textbook Question

Chapter 7.1, Problem 7E

A chemical engineer is studying the effect of temperature and stirring rate on the yield of a certain product. The process is run 16 times, at the settings indicated in the following table. The units for yield are percent of a theoretical maximum.

Temperature (°C)	Stirring Rate (rpm)	Yield (%)
110	30	70.27
110	32	72.29
111	34	72.57
111	36	74.69
112	38	76.09
112	40	73.14
114	42	75.61
114	44	69.56
117	46	74.41
117	48	73.49
122	50	79.18
122	52	75.44
130	54	81.71
130	56	83.03
143	58	76.98
143	60	80.99

a. Compute the correlation between temperature and yield, between stirring rate and yield, and between temperature and stirring rate.
b. Do these data provide good evidence that increasing the temperature causes the yield to increase, within the range of the data? Or might the result be due to confounding? Explain.
c. Do these data provide good evidence that increasing the stirring rate causes the yield to increase, within the range of the data? Or might the result be due to confounding? Explain.

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Chapter 7.1, Problem 6E

Chapter 7.1, Problem 8E

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Chapter 7 Solutions

STATISTICS FOR ENGR.+SCI.(LL)-W/ACCESS

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