Question

Independent random samples of

n₁ = 900 and n₂ = 900

observations were selected from binomial populations 1 and 2, and

x₁ = 120

and

x₂ = 150

successes were observed.

(a)

What is the best point estimator for the difference

(p₁ − p₂)

in the two binomial proportions?

p̂₁ − p̂₂

n₁ − n₂    

p₁ − p₂

x₁ − x₂

(b)

Calculate the approximate standard error for the statistic used in part (a). (Round your answer to three decimal places.)

(c)

What is the 95% margin of error for this point estimate? (Round your answer to three decimal places.)

Answer 1