5. To increse Barack Obama\'n visibility and to raise money for the 2008 electio

Question

5. To increse Barack Obama'n visibility and to raise money for the 2008 election campaign, his analytical tenin coondueted an A/B test with his website. The original vernsion hnd a button to join the campnign that read "Sign Up"; the alternative version's button read "Learn More" Of 77858 visitors to the original site, 5851 clicked the button. of 77729 visitors to the alternative site, 6927 clicked the button. Based on the following confidence interval, can it be concluded that there is a significant difference in the number of people clicking the button between the two sites? The 95% CI is : (00112 00167) a Since the CI contains 0, there is no significant difference in the sites ) Since the CI does not contain O, there is a significant difference in the sites (e) Since the CI does not contain 0, there is not a significant difference in the sites (d) Since the CI contains 0, there is a significant difference in the sites

Explanation / Answer

Zero is the null value of the parameter (in this case the difference in means). If a 95% confidence interval includes the null value, then there is no statistically meaningful or statistically significant difference between the groups.

But here there is no zero in CI

Hence b is correct answer.

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