A group of scientists wants to determine the efficacy of a vaccine. To do so they recruited 1000 subjects. Two months ago 300 random subjects received the vaccine T = 1. The other 700 received a placebo T = 0. The scientist also measured if the subjects became infected with the virus Y = 1 or not Y = 0 in the last 2 months. They plan to test the efficacy of the vaccine by running the following regression: Y = Bo+BiT tu Which of the following statements is FALSE: Select one: O a. This model will generate biased estimates because it does not control for many omitted variables O b. The fact that more people receive the placebo than the vaccine will not generate bias O c. Scientists do not need to observe the initial health status of the subjects to get unbiased estimates because the assignment of the vaccine was random O d. A negative B₁ would indicate that the vaccine is effective
A group of scientists wants to determine the efficacy of a vaccine. To do so they recruited 1000 subjects. Two months ago 300 random subjects received the vaccine T = 1. The other 700 received a placebo T = 0. The scientist also measured if the subjects became infected with the virus Y = 1 or not Y = 0 in the last 2 months. They plan to test the efficacy of the vaccine by running the following regression: Y = Bo+BiT tu Which of the following statements is FALSE: Select one: O a. This model will generate biased estimates because it does not control for many omitted variables O b. The fact that more people receive the placebo than the vaccine will not generate bias O c. Scientists do not need to observe the initial health status of the subjects to get unbiased estimates because the assignment of the vaccine was random O d. A negative B₁ would indicate that the vaccine is effective
Chapter4: Linear Functions
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Transcribed Image Text:A group of scientists wants to determine the efficacy of a vaccine. To do they recruited 1000 subjects. Two months ago 300 random subjects received the vaccine T = 1. The other 700 received a placebo T = 0. The
scientist also measured if the subjects became infected with the virus Y = 1 or not Y = 0 in the last 2 months.
They plan to test the efficacy of the vaccine by running the following regression:
Y = Bo + Bit tu
Which of the following statements is FALSE:
Select one:
a. This model will generate biased estimates because it does not control for many omitted variables
Ob. The fact that more people receive the placebo than the vaccine will not generate bias
Scientists do not need to observe the initial health status of the subjects to get unbiased estimates because the assignment of the vaccine was random
O d. A negative B₁ would indicate that the vaccine is effective
c.
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