)In which case would testing the null hypothesis involve a two-tailed statistical test? A)H₁: Incentive pay for teachers does affect student achievement B)H₁: Higher sales tax rates does not reduce state tax revenues C)H₁: Extending the duration of unemployment benefits does not increase the length of joblessness D)H₁: Smoking does not reduce life expectancy

Question

Quizplus · Accepted Answer

A two-tailed test is used when we are interested in determining whether there is a difference in either direction between the groups being compared. Choice A, which states "Incentive pay for teachers does affect student achievement," implies that we are looking for any effect, positive or negative, of incentive pay on student achievement, making it suitable for a two-tailed test.

)In Which Case Would Testing the Null Hypothesis Involve a Two-Tailed