Exam DA0-001 topic 1 question 21 discussion

Germany has a p-value of 0.09, which is greater than 0.05, indicating the difference is not statically significant. Answer is A

I believe that there is no statistical proof that C is correct. With a 95% Confidence Interval we are comparing to a p-value of 0.025 (half of 5%) and so A is a true statement

"Which of the following conclusions is accurate at a 95% confidence interval?" C. Answers this question more accurately then A

A. In Germany, the increase in conversion from the new layout was not significant. This conclusion is accurate because the p-value for Germany is 0.13, which is higher than the commonly used significance level of 0.05. A p-value of 0.13 means that there is a 13% chance that the increase in conversion from the new layout was due to random chance, and therefore, the increase is not considered statistically significant. This means that we cannot reject the null hypothesis that the new layout does not have any effect on the conversion rate in Germany. In contrast, the p-values for the United States, France, and Canada are lower than 0.05, meaning that the increase in conversion from the new layout in these countries is considered statistically significant. So, we can conclude that users who visit the new website are more likely to make a purchase in these countries.

A - 0.7% increase which is not significant (87% confidence) <- Correct B - 0.2% increase which is significant (95.5% confidence) <- Incorrect C - An average of -0.6% decrease which is not significant (94.8% Confidence) <- Incorrect D - With its 4.3% improvement, UK have the highest conversion rate

C. Based on the data in the table, it can be concluded that, in general, users who visit the new website are more likely to make a purchase. This conclusion can be made at a 95% confidence interval, which means that there is a 95% probability that this conclusion is accurate. The other conclusions are not supported by the data in the table. The data does not show a significant increase in conversion from the new layout in Germany or France, and the new layout does not have the lowest conversion rates in the United Kingdom.