Complete parts (a) through (c) below.

(a) Determine the criticalvalue(s) for aright-tailed test of a population mean at the =0.05 level of significance with 15 degrees of freedom.

(b) Determine the criticalvalue(s) for aleft-tailed test of a population mean at the =0.05 level of significance based on a sample size of n=10.

(c) Determine the criticalvalue(s) for atwo-tailed test of a population mean at the =0.10 level of significance based on a sample size of n=18.

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(a) tcrit=

minus

plus or minus

plus

+

(Round to three decimal places asneeded.)

(b) tcrit=

minus

plus or minus

plus

+

(Round to three decimal places asneeded.)

(c) tcrit=

minus

plus

+

plus or minus

(Round to three decimal places asneeded.)