A maker of fabric for clothing is setting up a new line to “finish” the raw fabric. The line will use either metal rollers or natural-bristle rollers to raise the surface of the fabric; a dyeingcycle time of either 30 or 40 minutes; and a temperature of either 150°C or 175°C. Three specimens of fabric will be subjected to each treatment and scored for quality.

a. List the factors in this experiment and state how many levels each factor has.

b. If the researchers used every possible combination to form the treatments, how many treatments were included in the experiment?

c. List two of the treatments.