Jose predicted that he would sell 48 umbrellas. He actually sold 72 umbrellas. What are the values of a and b in the table
below? Round to the nearest tenth if necessary
Percent Error
Approximate value
Exact value
Error
-24
Absolute error
Ratio
Item
Umbrellas
Percent error
24
3.333%
42. -50%
98.0-67.7%
57.0 - 100%
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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