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We want to test whether proportions of cancer differ between a group exposed to estrogen (Group1)...

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Statistics

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.

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Correct option A The    See Answer
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