# Perform a significance test to assess whether there is an association between mortality from cirrhosis of the liver and duration of employment in the group hired after 1945. Report a p-value.

How many people would need to be studied to have 80% power under the assumptions in Problem 7.7?

7.46 Perform a significance test to assess whether there is an association between mortality from cirrhosis of the liver and duration of employment in the group hired after 1945. Report a p-value.

7.63 Suppose we want to compare the observed and expected number of events among the group with

7.64 Provide a 95% CI for the expected number of events in the group with ≥ 250 treatments.

7.108 What is the 25th percentile of a χ2 distribution with 20 degrees of freedom? What symbol is used to denote this value?

7.109 Suppose we wish to test the hypothesis H0: μ = 2 vs. H1: μ ≠ 2. We find a two-sided p-value of .03 and a 95% CI for μ of (1.5, 4.0). Are these two results possibly compatible? Why or why not?

YOU CAN FIND ANSWER OF CHAPTER 8 and 10 (and even 9 + 11) DETAIL IN THE SOLUTION.