Calculate Conversion Lift CI

Q: Calculate Conversion Lift CI

This question evaluates statistical inference skills for proportions, specifically construction and interpretation of confidence intervals and hypothesis testing in A/B experiments using normal approximations.

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In an A/B test, the control group had 1,000 users and 120 conversions. The treatment group had 1,000 users and 150 conversions.

Using a normal approximation, calculate a 95% confidence interval for the absolute lift in conversion rate (treatment - control) by hand. Then state whether the result is statistically significant at the 5% level and explain the interpretation of the interval.

Calculate Conversion Lift CI

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