t= 1.45,df= 12, alpha = .05, two-tailed

critical value oft= Decision =

t= 2.90,df= 22, alpha = .01, two-tailed

critical value oft= Decision =

t= 2.60,df= 17, alpha = .05, one-tailed

critical value oft= Decision =

t= 1.70,df= 13, alpha = .05, one-tailed

critical value oft= Decision =