Fundamentos

sampsi .163 .078, alpha(0.05) n1(280) n2(520)

Estimated power for two-sample comparison of proportions

Test Ho: p1 = p2, where p1 is the proportion in population 1and p2 is the proportion in population 2
Assumptions:

alpha = 0.0500 (two-sided)
p1 = 0.1630
p2 = 0.0780
sample size n1 = 280n2 = 520
n2/n1 = 1.86

Estimated power:

power = 0.9316

sampsi .163 .078, alpha(0.05) n1(280) n2(620)

Estimated power for two-sample comparison ofproportions

Test Ho: p1 = p2, where p1 is the proportion in population 1
and p2 is the proportion in population 2
Assumptions:

alpha = 0.0500 (two-sided)p1 = 0.1630
p2 = 0.0780
sample size n1 = 280
n2 = 620
n2/n1 = 2.21

Estimated power:

power = 0.9450

sampsi.163 .078, alpha(0.05)

Estimated sample size for two-sample comparison of proportions

Test Ho: p1 = p2, where p1 is the proportion in population 1
and p2 is theproportion in population 2
Assumptions:

alpha = 0.0500 (two-sided)
power = 0.9000
p1 = 0.1630
p2 = 0.0780
n2/n1 = 1.00Estimated required sample sizes:

n1 = 330
n2 = 330

sampsi .163 .078, alpha(0.05) power(.80)

Estimated sample size for two-sample comparison of proportionsTest Ho: p1 = p2, where p1 is the proportion in population 1
and p2 is the proportion in population 2
Assumptions:

alpha = 0.0500 (two-sided)power = 0.8000
p1 = 0.1630
p2 = 0.0780
n2/n1 = 1.00

Estimated required sample sizes:

n1 = 253
n2 = 253