In an article in the Journal of Advertising, authors Weinberger and Spotts compa

Question

In an article in the Journal of Advertising, authors Weinberger and Spotts compare the use of humor in advertising in the United States and the United Kingdom. Suppose the independent random samples of television ads are taken in the two countries. A random sample of 400 television ads in the United Kingdom reveals that 142 use humor, while a random sample of 500 TV ads in the United States reveals that 122 use humor. Use the six step process to determine if there is any difference (two tailed test) in the proportion of ads that use humor in the UK and US. ? .05 Stated Hypothesis Which of the following best represents the decision rule for the Journal of Advertising? a) If the Z critical ratio is less than-1.645 or greater than 1.645 reject the null of equal proportions b) If the Z critical ratio is less than -1.96 or greater than 1.96 reject the null of equal proportions c) If the Z critical ratio is less than -2.575 or greater than 2.575 reject the null of equal proportions d) If the Z critical ratio is less than -1.7959 or greater than 1.7959 reject the null of equal proportions e) If the Z critical ratio is greater than 1.645 reject the null of equal proportions

Explanation / Answer

This is a two tailed test with level of significance 0.05 so the critical values will be:

z = -1.96, 1.96

Option B is correct.

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