Question

An article in Technometrics (1974, Vol. 16, pp. 523-531) considered the following stack-loss data from a plant oxidizing ammonia to nitric acid. Twenty-one daily responses of stack loss (the amount of ammonia escaping) were measured with air flow x1, temperature x2, and acid concentration x3. (a) Fit a linear regression model relating the results of the stack loss to the three regressor variables. (b) Estimate σ^2. (c) Find the standard error se (β̂j). (d) Use the model in part (a) to predict stack loss when x1 = 60, x2 = 26, and x3 = 85.

          An article in Technometrics (1974, Vol. 16, pp. 523-531) considered the following stack-loss data from a plant oxidizing ammonia to nitric acid. Twenty-one daily responses of stack loss (the amount of ammonia escaping) were measured with air flow x1, temperature x2, and acid concentration x3. (a) Fit a linear regression model relating the results of the stack loss to the three regressor variables. (b) Estimate σ^2. (c) Find the standard error se (β̂j). (d) Use the model in part (a) to predict stack loss when x1 = 60, x2 = 26, and x3 = 85.

Added by Steven W.

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