A sample is selected from a population with= 40. After a treatment is administered to the individuals in the sample, the mean is found to be M = 45 and the variance is s2= 16. If the sample hasn= 4 scores, then conduct a hypothesis test to evaluate the significance of the treatment effect. Use a two-tailed test with= .05.

Group of answer choices:

Fail to reject the null, T-obtained = 1.21

Reject the null, T obtained=2.5

Fail to reject the null, T obtained = 2.110

Reject the null, T-obtained = 3.182