An important factor in selecting software for word$-$processing and database management systems is the time required to learn how to use the system. To evaluate three file management systems, a firm designed a test involving word processing operators. Since operator variability was believed to have an impact, each of the operators was trained on all three of the file management systems.

ANALYSIS OF VARIANCE TABLE

SUM OF SQ$\text{'}$S

D$.$F$.$ MEAN SQ$.$ F$($D$.$F$./8)$ P$-$VALUE

System $103\mathrm{.}33,2,51\mathrm{.}67,56\mathrm{.}36,0\mathrm{.}000019$

Operator

$\backslash$table$[[,64\mathrm{.}67,4,16\mathrm{.}17,17\mathrm{.}63,0\mathrm{.}000494]]$

ERROR $7\mathrm{.}33,8,0\mathrm{.}92$

TOTAL $175\mathrm{.}33,14$

If we are using an alpha value of $\mathrm{.}05$ then we would conclude that

A$)$ differences exist among both systems and operators.

B$)$ differences exist among systems only.