Question

Independent random samples of n1 = 900 and n2 = 900 observations were selected from binomial...

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?

1 − p̂2

n1n2    

p1p2

x1x2

(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.)

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