A machine shop has four different machines (factor A: machines 1, 2, 3, 4) used in precision grinding of metal bearings. Three different machine operators (factor B: operators A, B, C) are employed to determine whether there are differences in output among the operators or the machines, each operator is assigned to work on each machine, on each of three different days. The number of parts produced each day on each machine for each operator are listed in the table below.

QUESTIONS:

a) All operators perform worst (produce the least number of parts) when using machine _______ (1 / 2 / 3 / 4).

b) When using machine 2, operator _______(A / B / C) appears to perform best, while operator_______(A / B / C) appears to perform worst.

c) When using machine 4, operator _______ (A / B / C) appears to perform best, while operator _______ (A / B / C) appears to perform worst.

d) Operator A appears to perform best when using machine _______ (1 / 2 / 3 / 4).

e) All three operators appear to have roughly similar levels of performance when using machine _______ (1 / 2 / 3 / 4).

f) Operator C appears to have roughly similar levels of performance when using machines _______ (1 / 2 / 3 / 4). (List multiple answers in any order, separated by only a single space.)

Machine (A) The interaction plots for the given data are provided below. Using only these plots, complete the statements below