Alock on a bank vault consists of three dials, each with 30 positions, in order for the vault to open, each of the three dials must be in the correct position. how many different "dial combinations" are there for this lock? place your answer in the blank. do not use any decimal places or commas. for example, 12345 would be a legitimate entry.

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