A building superintendent wishes to compare three relative performance ratings o

Question

A building superintendent wishes to compare three relative performance ratings of various combinations of floor wax and length of polishing time. Three waxes are to be investigated along with 3 polishing times. Thirty-six homogeneous floor areas are selected and 4 areassigned at random to each of the 9 treatment combinations. The results are shown below:

Identify the design for this experiment.

Performance Ratings High is better than Low Wax Polishing time1;5 45 15 30 45 15 45 30 7.5 7.2 30 (in minutes) 8.2 8.6 8.8 7.2 7.6 7.2 7.5 9.2 9.4 9.6 9.2 9.6 9.5 9.7 9.5 7.2 6.8 7.3 8.2 7.2 7.7

Explanation / Answer

The experimental design in question is factorial design.

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