The values listed below are the obtained values for a t statistic.

(1) What is your decision for each if df = 30 and α = .05 for a two-tailed test?

(2) What is your decision for each if df = 30, and we change to α = .01 for an upper-tail critical test?

(a) tobt = 2.050

(b) tobt = 1.680

(c) tobt = 2.834

(d) tobt = 3.030