solution

In an era of increased awareness of the need for energy conservation, it is of interest to find out, when preparing a roast, what the consequences are of (1) thawing a frozen roast before cooking and (2) preheating the oven. The purpose of this 2 × 4 factorial experiment is to provide some answers to these questions. The factors and levels are:

Factor 1 (OVEN): level 1, not preheated (NOT PRE)

                               level 2, preheated (PRE)

Factor 2 (COND): level 1, fresh meat (FRESH)

                               level 2, frozen meat (FROZEN)

                               level 3, frozen, thawed for 12 h (12-THAW)

                               level 4, frozen, thawed for 24 h (24-THAW)

Starting with 40 roasts of the same size and configuration, five were randomly assigned to each of the eight factor level combinations. Each roast was cooked until the internal temperature reached 160â—¦F. The response is total fuel requirement (GAS).