A mechanical engineer is studying the thrust force developed by a drill press. He suspects that the drilling speed and the feed rate of the material are the most important factors.

He selects four feed rates and uses a high and low drill speed chosen to represent the extreme operating conditions.

He obtains the following results. Analyze the data and draw conclusions. Use ???? = 0.05.
Feed Rate Drill Speed 0.015 0.030 0.045 0.060 125 2.70 2.45 2.60 2.75 2.78 2.49 2.72 2.86 200 2.83 2.85 2.86 2.94 2.86 2.80 2.87 2.88