Suppose a professor wants to know how the time spent studying affects student performance on microeconomic exams in college. She uses her class as a convenience sample, and she implements a randomized controlled trial by randomly dividing her class into a treatment and a control group to answer this question. Her experimental data contains the number of hours students study per week and their final microeconomics exam scores. If she estimates the following bivariate model using OLS, will her estimates of betao and betal be unbiased? Why or why not? examscore ibeta0-beta1*hrsstudy_i+u_ No, because exam scores are unlikely to be normally distributed. Yes, because she conducted a randomized controlled trial. Yes, because there are unlikely to be outlier observations in exam scores or hours spent studying No, because she didn't collect a random sample from the population of interest. No, because there is likely no relationship between study time and exam scores. Yes, because the OLS estimation method gives the causal effect of X on Y. No, because there are likely omitted variabies in u_i that are correlated with hours spent studying and student exam scores.

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Suppose a professor wants to know how the time spent studying affects student performance on microeconomic exams in college. She uses her class as a convenience sample, and she implements a randomized controlled trial by randomly
dividing her class into a treatment and a control group to answer this question. Her experimental data contains the number of hours students study per week and their final microeconomics exam scores. If she estimates the following bivariate
model using OLS, will her estimates of beta0 and beta1 be unbiased? Why or why not?
examscore_i=beta0+beta1*hrsstudy_i+u_i
No, because exam scores are unlikely to be normally distributed.
Yes, because she conducted a randomized controlled trial.
Yes, because there are unlikely to be outlier observations in exam scores or hours spent studying.
No, because she didn't collect a random sample from the population of interest.
No, because there is likely no relationship between study time and exam scores.
Yes, because the OLS estimation method gives the causal effect of X on Y.
No, because there are likely omitted variables in u_i that are correlated with hours spent studying and student exam scores.
Transcribed Image Text:Suppose a professor wants to know how the time spent studying affects student performance on microeconomic exams in college. She uses her class as a convenience sample, and she implements a randomized controlled trial by randomly dividing her class into a treatment and a control group to answer this question. Her experimental data contains the number of hours students study per week and their final microeconomics exam scores. If she estimates the following bivariate model using OLS, will her estimates of beta0 and beta1 be unbiased? Why or why not? examscore_i=beta0+beta1*hrsstudy_i+u_i No, because exam scores are unlikely to be normally distributed. Yes, because she conducted a randomized controlled trial. Yes, because there are unlikely to be outlier observations in exam scores or hours spent studying. No, because she didn't collect a random sample from the population of interest. No, because there is likely no relationship between study time and exam scores. Yes, because the OLS estimation method gives the causal effect of X on Y. No, because there are likely omitted variables in u_i that are correlated with hours spent studying and student exam scores.
Suppose a professor wants to know how the time spent studying affects student performance on microeconomic exams. She collects a random sample of observational data on students in 2019. Her data contain the number of hours students
study per week and their final microeconomics exam scores. If she estimates the following bivariate model using OLS, will her estimates of beta0 and beta1 be unbiased? Why or why not?
examscore_i=beta0+beta1+hrsstudy_i+u_i
No, because exam scores are unlikely to be normally distributed.
No, because there are likely omitted variables in u_i that are correlated with hours spent studying and student exam scores.
Yes, because she collected a random sample.
Yes, because the OLS estimation method gives the causal effect of X on Y.
Yes, because there are unlikely to be outlier observations in exam scores or hours spent studying.
No, because there is likely to be no relationship between studying and exam scores.
Transcribed Image Text:Suppose a professor wants to know how the time spent studying affects student performance on microeconomic exams. She collects a random sample of observational data on students in 2019. Her data contain the number of hours students study per week and their final microeconomics exam scores. If she estimates the following bivariate model using OLS, will her estimates of beta0 and beta1 be unbiased? Why or why not? examscore_i=beta0+beta1+hrsstudy_i+u_i No, because exam scores are unlikely to be normally distributed. No, because there are likely omitted variables in u_i that are correlated with hours spent studying and student exam scores. Yes, because she collected a random sample. Yes, because the OLS estimation method gives the causal effect of X on Y. Yes, because there are unlikely to be outlier observations in exam scores or hours spent studying. No, because there is likely to be no relationship between studying and exam scores.
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