In 1957, Japanese engineers designed a train that broke world records for speed. The rate of speed was constant and is shown in the tables below. time distance
5 min 12.9 miles
20 min. 51.6 miles

Six years later, in 1963, Japanese engineers again set a world record by designing a train that could run 75% faster than the train they developed in 1957.

If both trains traveled for a total of 2.5 hours, how much farther would the train designed in 1963 travel than the train designed in 1957?

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