Complete parts ?(a) through ?(c) below

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Complete parts ?(a) through ?(c) below.

?(a) Determine the critical? value(s) for a? right-tailed test of a population mean at the alphaequals0.10 level of significance with 20 degrees of freedom. ?

(b) Determine the critical? value(s) for a? left-tailed test of a population mean at the alphaequals0.10 level of significance based on a sample size of nequals15.

?(c) Determine the critical? value(s) for a? two-tailed test of a population mean at the alphaequals0.05 level of significance based on a sample size of nequals12.