Question: Consider the data below. These data were collected in an experiment where x1 = reaction time in minutes and x2 = temperature in degrees Celsius.

Consider the data below.

X2 50 75 100 4.70 5.52 3.98 2 2.68 3.75 4.22 6.35

These data were collected in an experiment where x1 = reaction time in minutes and x2 = temperature in degrees Celsius. The response variable y is concentration (grams per liter). The engineer is considering the model y xx = θ ε

a. Note that we can linearize the expectation function by taking logarithms.
Fit the resulting linear regression model to the data.

b. Test for signifi cance of regression. Does it appear that both variables x1 and x2 have important effects?

c. Analyze the residuals and comment on model adequacy.

X2 50 75 100 4.70 5.52 3.98 2 2.68 3.75 4.22 6.35 5.88 6.28 x 4 6.10 7.69 7.12 7.85 9.00 11.43. 6 9.25 9.78 9.62

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