Another chemical engineer is studying the same process as in Exercise 7, and uses the following e
Another chemical engineer is studying the same process as in Exercise 7, and uses the following experimental matrix.
.
Another chemical engineer is studying the same process as in Exercise 7, and uses the following e
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Temperature
Stirring
(?C)
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 stirring rate.
b. Do these data provide good evidence that the yield is unaffected by temperature, 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.
d. Which experimental design is better, this one or the one in Exercise 7? Explain.
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