We want to test whether proportions of cancer differ between agroup exposed to estrogen (Group1) and a placebo group (Group2)(two-sided). Let n1=8506 and n2=8102. After a fiveyear follow up, Group 1 had 751 incidents while the Group 2 had 623incidents.
State null and alternative hypotheses.
Calculate the proportions of incidents in both samples combined,Ï€^. (Report up to 4 decimal places.)
Compute the test statistics, Z. (Round up to 2 decimalplaces).
Compute the p-value (two-sided).
Can you reject H0 at α=0.05?
What can you conclude?
A. The (population) proportion of cancer significantly differbetween two groups at 95% confidence level.
B. The (population) proportion of cancer does not significantlydiffer between two groups at 95% confidence level.
