36. Mr. Briggs owns a small store and is planning a back-to-school special on selected school supplies. He wants to put together a package of pens and pencils. If pens sell for 39¢ each and pencils sell for three for
50¢, how many pens and pencils are in a set that contains sixteen writing instruments and sells for $3.56
per package?

Researchers are conducting experiments to determine the role of alcohol in the development of depression. after the study is complete, they determine that the relative risk of developing depression is 1.55 with a 95 % ci of 1.2 -1.9. each group is then divided into nonsmokers and smokers. the relative risk for the nonsmokers is 1.12 with a 95% ci of 0.87-1.37. the relative risk for the smokers is 1.7 with a 95 % cl of 1.5-1.9. what type of bias may affect this study? a. procedure bias b. recall bias c. selection bias d. confounding e. lead-time bias