ווייוייף The heights, in cm, of 50 students are recorded and used to draw the cumulative
frequency graph shown below.
507
40
30
Cumulative frequency
Use the graph to estimate the number of
these students with a height above 150 cm.
10
students
0
120
130
160
140 150
Height (cm)
170
H
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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