Exhibit $13-3$

To test whether or not there is a difference between treatments A$,$ B$,$ and C$,$ a sample of $12$ observations has been randomly assigned to the three treatments. You are given the results below.

Treatment

Observation

A

$20$

$30$

$25$

$33$

B

$22$

$26$

$20$

$28$

C

$40$

$30$

$28$

$22$

$$

Refer to Exhibit $13-3.$ The null hypothesis $\_\_\_\_\_.$

Question $44$ options:

should be rejected

should not be rejected

should be revised

should be retested