In each of the following, identify the response, the factors, the levels, and the total number of treatments. Also identify which variables are categorical and which are quantitative.
(i) A chemical engineering catalysis researcher is interested in the effect of NO concentration, (3500 ppm, 8650 ppm); O2 concentration (4%, 8%); CO concentration, (3.5%, 5.5%); Space velocity, (30,000, 42,500) mL/hr/gcat; Temperature, (548 K, 648 K); SO2 concentration, (0 ppm, 300ppm); and Catalyst metal type, (Pt, Ba, Fe), on saturation NOx storage (μ mol).
(ii) A material scientist studying a reactive extrusion process is interested in the effect of screw speed, (135 rpm, 150 rpm), feed-rate, (15 lb/hr, 25 lb/hr), and feed- composition, %A, (25, 30, 45) on the residence time distribution, f (t).
(iii) A management consultant is interested in the risk-taking propensity of three types of managers: entrepreneurs, newly-hired managers and newly promoted managers.
(iv) A child psychologist is interested in the effect of socio-economic status of parents (Lower class, Middle class, Upper class), Family size (Small, Large) and Mother's marital status (Single-never married, Married, Divorced), on the IQ of 5-year-olds.