2 Proportion Z Test

Question 1

What are the conditions?

Answer 1

SRS for each sample
Two independent samples
For normality show np (greater than or equal to) 10 and n(1-p) (greater than or equal to) 10 for both samples
Population is at least 10X the sample size for both samples

Question 2

What is the correct hypothesis statement?

Answer 2

H0: P1=P2
HA: P1 does not equal P2

Question 3

What is the formula for standard error?

Answer 3

((p(1-p)/n1) + (p(1-p)/n2))^(1/2)

Question 4

How do you calculate p?

Answer 4

p = (x1 + x2)/(n1 + n2)

Question 5

What is the test statistic?

Answer 5

z = (p1 - p2) / standard error