First, count the tally marks and record the data in the frequency table. Shoe Lengths Length in Tally Centimeters Boys Girls 18 6 4 19 an 4. 20 9 9 21 7 5 22 10 7 To find the difference between the shoes that were 18 or 22 centimeters long and the shoes that were 20 centimeters long, subtract the sums. So, more shoes were 18 or 22 centimeters long than 20 centimeters long. A Question 1 of 5 Check Answer N​

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