Answer:
1.330391 ; 1.734064 ; 1.713872 ; 1.670649 ;
Step-by-step explanation:
a) t0.10, 18
α = 0.10 ; df = 18
From table, critical value = 1.330
(b) t0.05, 18
α = 0.05 ; df = 18
From table, critical value = 1.734
(c) t0.05, 23
α = 0.05 ; df = 23
From table, critical value = 1.714
(d) t0.05, 60
α = 0.05 ; df = 60
From table, critical value = 1.671
(e) t0.005, 60
α = 0.05 ; df = 60
From table, critical value = 2.660