Complete parts (a) through (c) below. (a) Determine the critical value(s) for a

Question

Complete parts (a) through (c) below.

(a) Determine the critical value(s) for a right-tailed test of a population mean at the a=0.05 level of significance with 20 degrees of freedom.

(b) Determine the critical value(s) for a left-tailed test of a popualtion mean at the a=0.01 level of significance based on a sample sice of n=10.

(C) Determine the critical value(s) for a two-tailed test of a population mean at the a=0.01 level of significance based on a sample size of n=19.

(a) tcrit + or - or + over - __

(b)tcrit + or - or + over - __

(c) tcrit + or - or + over - __

(Round to three decimal places as needed or each)

Explanation / Answer

Solution:

(a) Critical value at df= 20 and right tailed with  a=0.05 i.e t20,0.05 = 1.725

(b) critical value at df = 10-1 = 9 and a=0.01 i.e. -t9,0.01 = -2.821

(c) a=0.01 and df = 19-1 =18 i.e. t18,0.005 = +-2.878

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