To begin the analysis, from the menus choose:

Analyze
Compare Means
One-Way ANOVA...

Select Total DVD assessment as the dependent variable.

Select Age Group as the factor variable.

Click Contrasts.

The first contrast compares only groups 3 and 4; the others are eliminated by giving them weights of 0.

Type 0 as the coefficient for group 1, then click Add.

Add another coefficient of 0 for group 2.

Next, add the coefficients for groups 3 and 4 so that together they sum to 0.

Type -1 as the coefficient for group 3, then click Add.

Add a coefficient of 1 for group 4.

Type 0 as the coefficient for group 5, then click Add.

Add another coefficient of 0 for group 6.

Click Next to move to the second contrast.

The second contrast compares groups 1 and 2 with groups 5 and 6. Groups 3 and 4 are eliminated.

Type .5 as the coefficient for group 1, then click Add.

Add another coefficient of .5 for group 2.

Next, groups 3 and 4 are each given coefficients of 0.

Type 0 as the coefficient for group 3, then click Add.

Add another coefficient of 0 for group 4.

So the sum of contrast coefficients will equal 0, groups 5 and 6 receive coefficients of -.5.

Type -.5 as the coefficient for group 5, then click Add.

Add another coefficient of -.5 for group 6.

Click Continue.

Click OK in the One-Way ANOVA dialog box.