To begin the chi-square analysis, from the menus choose:

Analyze
 Nonparametric Tests
  Chi-Square...

step Select Week of Response as the test variable.

The expected frequencies are the response percentages that the firm has historically obtained with bulk mail.

step Select Values in the Expected Values group.

step Type 6 as the first expected value, then click Add.

step Repeat this process, consecutively adding the values 15.1, 18, 12, 11.5, 9.8, 7, 6.1, 5.5, 3.9, 2.1, and 2.

step After the 12 values have been entered, click OK.