Answer
$µ_1=µ_3\neµ_2=µ_4$
Work Step by Step
In MINITAB, enter the Sample1 values in C1, the Sample 2 values in C2, the Sample 3 in C3 and in C4 enter the Sample 4 values.
Select Stat -> ANOVA -> One-Way
Select Response data are in a separate column for each factor level.
In Responses enter C1 C2 C3 C4
Click Comparisons. In "Error rate for comparisons" enter 5. In "Comparison procedures assuming equal variances" select Tukey. In "Results" select the 3 options. Click OK.
Click Ok.
