Question: A 95% confidence interval for p 1 p 2 given counts of 240 yes out of 500 sampled for Group 1 and 450 yes

A 95% confidence interval for p₁ − p₂ given counts of 240 yes out of 500 sampled for Group 1 and 450 yes out of 1000 sampled for Group 2.

Use the normal distribution to find a confidence interval for a difference in proportions p₁ − p₂ given the relevant sample results. Give the best estimate for p₁ − p₂, themargin of error, and the confidence interval. Assume the results come from random samples.

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