Problems from Rosner 8^th edition:

Occupational Health

The proportion of deaths due to lung cancer in males ages

15-64 in England and Wales during the period 1970-

1972 was 12%. Suppose that of 20 deaths that occur

among male workers in this age group who have worked

for at least 1 year in a chemical plant, 5 are due to lung

cancer. We wish to determine whether there is a difference

between the proportion of deaths from lung cancer in this

plant and the proportion in the general population.

State the hypotheses to use in answering this question.

Is a one-sided or two-sided test appropriate here?

Perform the hypothesis test, and report a p-value.