Gonif International sells vacation time shares using Internet banner ads. They want to test the average daily sales rates for three different banner ads targeted to the same consumer group. The first question they need to answer: How large a total sample do they need? This means, how many days should they run the test. Each of the three designs will make up one third of the observations, so the total number of days required is one-third the total sample s
- Test Set-Up
Gonif International sells vacation time shares using Internet banner ads. They want to test the average daily sales rates for three different banner ads targeted to the same consumer group. The first question they need to answer: How large a total sample do they need? This means, how many days should they run the test. Each of the three designs will make up one third of the observations, so the total number of days required is one-third the total sample size. Management’s goal is to achieve statistical power of at least 80%. Based on their experience, they estimate that Cohen’s f effect size will be about 0.25, which is a small effect. Use this estimate of Cohen’s f effect size to calculate a priori statistical power.
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