USE SALT (a) Central area = 0.95, df = 15 (b) Central area = 0.95, df = 30 (c) Central area = 0.99, df = 30 ± (d) Central area= 0.99, df = 60 ± (e) Upper-tail area = 0.01, df = 25 (f) Lower-tail area = 0.025, df = 10

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