A pharmaceutical company has developed a newdrug that they believe could improvestudents'performance on a statistics exam.To test the drug's effects,they randomly select30students,give half of them a control substance(group1),and give the other half the drug(group2).Both groups take the statistics exam,and the graph below portrays the resulting group mean scores.Remember they are expecting an improvement in the experimental group.The drug company sets their significance level(alpha)to.05for the hypothesis test between the two groups(group1=no drug/Control;and group2=drug/Experimental).

If you were conducting a hypothesis test on this scenario, Step 2 would look like:

a. if tobt tcrit = -1.701 , then reject H0; if tobt > tcrit , then fail to reject Ho.

b. if tobt tcrit = -2.048 , then reject H0; if tobt > tcrit , then fail to reject Ho.

c. if tobt tcrit = 1.701 , then reject H0; if tobt < tcrit , then fail to reject Ho.

d. if |tobt| |tcrit = 2.048| , then reject H0; if tobt < tcrit , then fail to reject Ho.