Question

You may need to use the appropriate appendix table or technology to answer this question.

Consider the following results for independent samples taken from two populations.

Sample 1	Sample 2
n1 = 400	n2 = 300
p1 = 0.49	p2 = 0.34

(a)

What is the point estimate of the difference between the two population proportions? (Use

p₁ − p₂.

)

(b)

Develop a 90% confidence interval for the difference between the two population proportions. (Use

p₁ − p₂.

Round your answer to four decimal places.)

to

(c)

Develop a 95% confidence interval for the difference between the two population proportions. (Use

p₁ − p₂.

Round your answer to four decimal places.)

to

Answer 1

The statistical software output for this problem is :

(a)

point estimate = 0.15

(b)

(0.0891 , 0.2109)

(c)

(0.0774 , 0.2226)