Question: A firm that has developed a new type of light bulb is interested in evaluating its performance in order to decide whether to market it.

A firm that has developed a new type of light bulb is interested in evaluating its performance in order to decide whether to market it. It is known that the light output of the bulb depends on the cleanliness of its surface area and the length of time the bulb has been in operation. Use the data in the next table and the procedures you learned in this chapter to build a regression model that relates drop in light output to bulb surface cleanliness and length of operation. Be sure to conduct a residual analysis also.

Drop in Light Output (96 onginal output) Bulb Surface (C clean) (D=dirty) Length of Operation (hours) 400 800 1,200 1,600 2,000 2.400 27 32 400 1,200 1,600 2,000 2,400 12

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