a) Given the Following Data & (DC) = 95% , Find the (CI)! 22 9 6 12 18 14 7 10 4 21 18 31 14 25 15 23

The following table summarizes data collected in a study to evaluate a new screening test for lung cancer. A total of 200 men were involved in the study. The results are tabulated below.     Lung Cancer Free of Lung Cancer Screening Test Positive 28 23   Negative 32 117 Find the false positive fraction of the screening test. (Round your answer to 2 decimal places).

In the book Business Research Methods (5th ed.). Donald R. Cooper and C. William Emory discuss studying the relationship between on-the-job accidents and smoking. Cooper and Emory describe the study as follows: Suppose a manager implementing a smoke-free workplace policy is interested in whether smoking affects worker accidents. Since the company has complete reports of on-the-job accidents, she draws a sample of names of workers who were involved in accidents during the last year. A similar sample from among workers who had no reported accidents in the last year is drawn. She interviews members of both groups to determine if they are smokers or not. The sample results are given in the following table. On-the-Job No 7 Smoker Heavy Moderate Nonsmoker 16 Column total 34 Heavy Moderate Yes Nonsmoker Total 12 6 Expected counts are below observed counts No Accident Total 19 7 9.21 9 Row 1 Row 2 Row 3 Column 1 Column 2 16 32 Accident 12 9.79 6 Accident Row Total 7.27 16 15.52 32 7.73 16…

7. Find the z-score that cuts off a left tail whose area is 2.5%. 8. Find the z-score that cuts off a right tail whose area is 10.75%.