Answer Happy

The monthly electric power consumed by an aluminum smelting
plant is thought to be related to the
average ambient temperature (x 1 ), the number of days in the month
(x 2 ), the average product purity (x 3 ), and the
tons of product produced (x 4 ). The past year’s historical data
are available and are presented in Table 2.
(a) Fit a multiple linear regression model to these data using
Minitab. Hint: no need of “stepwise
regression”.
(b) What is R 2 for the model in (a)?
(c) Predict power consumption for a month in which x 1 = 75°F,
x 2 = 24 days, x 3 = 90%, and x 4 = 98
tons.
X, F Table 2. Power consumption data of aluminum smelting plant in the past year. y, MWh X, days X, tons 248 25 24 91 100 236 31 21 90 95 270 45 24 88 110 274 60 25 87 88 301 65 25 91 94 316 72 26 94 99 300 80 26 87 97 296 84 25 86 96 267 75 24 88 110 276 60 25 91 105 288 50 25 90 100 261 38 23 89 98