A grad student\'s thesis is based on the effect of alcohol on test scores of peo
ID: 3067173 • Letter: A
Question
A grad student's thesis is based on the effect of alcohol on test scores of people 21 or older. The sample size is n. It is well documented by previous research that alcohol negatively affects scores, as noted in the grad student's literature review. The left column is people who have not consumed alcohol and the right column is the same person whe has consumed some amount of alcohol. 10 Should he use a one- or two-talled test? One-tailed because he has strong documentation that alcohol harms test scores O Two-tailed because the alcohol is a significant predictor of test scores One-tailed because he only cares if alcohol helps test scoresExplanation / Answer
Here the alternative hypothesis is to test whether the scores negatively affect the test scores.
In order to do that we need to check whethere the average test score without alcohol is greater than the average test score with alcohol.
H1: mu1 - mu2 > 0
this results into one tailed test
One tailed test because he hass strong documentation that alcohol harms test scores.
Option A is correct