Use Table A.3 to find the critical value t2 needed to construct a confidence interval of the
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Use Table A.3 to find the critical value tα∕2 needed to construct a confidence interval of the given level with the given sample size:
a. Level 95%, sample size 15
b. Level 99%, sample size 22
c. Level 90%, sample size 63
d. Level 95%, sample size 2
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