1. Four male monkeys were raised individually,and their testosterone levels were measured.
2. They were then put together in the same cage and,after two months,their testosterone wasmeasured again.The meanof the difference scoresfor testosterone level(time2minus time1)was M_D=2.70.The standard deviationof the difference scores(S_D)=2.54.Test the hypothesis that whenmale monkeyslive with others(time2)they havehighertestosterone levels than when they live alone(time1).Usealpha=0.05.

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

a. if tobttcrit, then reject H0; if tobt < tcrit , then fail to reject Ho.

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

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

d. if |tobt||tcrit| , then reject H0; if tobt > tcrit , then fail to reject Ho.