A plastic injection molding process is often used in manufacturing because of its ability to mold complicated shapes. An experiment was conducted on the manufacture of a television remote part, and the warpage (mm) of the part was measured and stored in TVRemote.

Source: Data extracted from M. A. Barghash and F. A. Alkaabneh, “Shrinkage and Warpage Detailed Analysis and Optimization for the Injection Molding Process Using Multistage Experimental Design,” Quality Engineering, 26, 2014, pp. 319–334.

Two factors were to be considered, the filling time (1, 2, or 3 sec) and the mold temperature (60, 72.5, or 85 °C). At the 0.05 level of significance,

a. is there an interaction between filling time and mold temperature?

b. is there an effect due to filling time?

c. is there an effect due to mold temperature?

d. If appropriate, use the Tukey multiple comparison procedure to determine which of the filling times and mold temperatures differ.