Answer
$F_0=6.52$ with a P-value $\ltα$. Reject the null hypothesis.
We can conclude that al least one population mean is different from the others.
Work Step by Step
In MINITAB, enter the data according to the table below.
Select Stat -> ANOVA -> General Linear Model -> Fit General Linear Model
In Responses enter C3. In Factors enter C1 C2.
Click Ok.
$F_0=6.52$ with a P-value $=0.015\ltα=0.05$
