Question

A gas chromatograph is used to measure the amounts of various compounds that are present in a sample. It contains a counter that gives a value proportional to the amount of the compound present. An experiment was done to see what the effects of the Flow Rate (fast or slow) and the Concentration (high, low, or medium) have on the Count. Each mixture was run 5 times and the total count was recorded each time.

a) What are the factors, and how many levels of each do they have?

b) What is the response variable?

Answer 1

(a)

Factor 1: Flow Rate:

                      Number of levels = 2 Nos.

                                         Level 1: Fast

                                          Level 2 : Slow

Factor 2: Concentration

                   Number of levels = 3 Nos.

                                       Level 1: High

                                      Level 2: Low

                                      Level 3: Medium

(b)

Response variable:

The amount of the compound present