Question 8

The CDC wants to determine why COVID-19 infection rates are lower in some states than in others. What statistical method would be most appropriate?

1.) A hypothesis test with a null hypothesis that the infection rate is less than or equal to the expected number

2.) A regression with the infection rate as the independent variable

3.) A regression with the infection rate as the dependent variable

4.) A hypothesis test with a null hypothesis that the infection rate is greater than or equal to the expected number

5.) A confidence Interval with the expected number of infections per state as the mean