Suppose that a study estimates the effect of lockdowns by looking at the rates of COVID-19 infection across states over time when some of those states implement lockdowns and others do not. Which approach does this study take? a.Cross-sectional regression analysis b.Differences-in-Differences analysis c.Regression discontinuity d.Time series analysis

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Suppose that a study estimates the effect of lockdowns by looking at the rates of COVID-19 infection across states over time when some of those states implement lockdowns and others do not. Which approach does this study take?

a.Cross-sectional regression analysis

b.Differences-in-Differences analysis

c.Regression discontinuity

d.Time series analysis

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