## Info

The value of a/2 corresponding to zai2 = 1.26 is, from Table 3 of the Appendix, a/2 = .1038. Therefore, the /7-value of the test against the two-sided alternative is .2076. The null hypothesis that the population proportions of humorous advertisements are the same can be rejected at significance levels greater than 20.76%. This reflects just a moderate amount of evidence in the data against the null hypothesis.

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