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 $103\mathrm{.}33251\mathrm{.}6756\mathrm{.}360\mathrm{.}000019$

Operator $64\mathrm{.}67416\mathrm{.}1717\mathrm{.}630\mathrm{.}000494$

ERROR $7\mathrm{.}3380\mathrm{.}92$

$---------------------------------------------------------------$

TOTAL $175\mathrm{.}3314$

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

Question $9$ options:

A$)$

differences exist among both systems and operators.

B$)$

differences exist among systems only.

C$)$

differences exist among operators only.

D$)$

no differences exist.