Website experiment. The OpenIntro website occasionally experiments with design and link place- ment. We conducted one experiment testing three different placements of a download link for this textbook on the book’s main page to see which location, if any, led to the most downloads. The number of site visitors included in the experiment was 701 and is captured in one of the response combinations in the following table:
Download No Download
Position 1 13.8% 18.3% Position 2 14.6% 18.5% Position 3 12.1% 22.7%
(a) Calculate the actual number of site visitors in each of the six response categories.
(b) Each individual in the experiment had an equal chance of being in any of the three experiment groups. However, we see that there are slightly different totals for the groups. Is there any evidence that the groups were actually imbalanced? Make sure to clearly state hypotheses, check conditions, calculate the appropriate test statistic and the p-value, and make your conclusion in context of the data.
(c) Complete an appropriate hypothesis test to check whether there is evidence that there is a higher rate of site visitors clicking on the textbook link in any of the three groups.
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