Blake pulls a stationary 20 kg box to the right with a force of 500
N. The coefficient of friction (p)
between the block and the
ground is 0.25 as it accelerates
across the floor. What is the
acceleration in m/s?? 1. 22.5475
2. 24.9875
3. 24.7548
4. 15.333
5. 20.2554
6. 20.6840
7. 24.5667
8. 22.1155

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