t-models, part I Using the t tables, software, or a calcu-lator, estimate a) the critical value of t for a 90% confidence intervalwith df = 17.b) the critical value of t for a 98% confidence intervalwith df = 88.c) the P-value for t Ú 2.09 with 4 degrees of freedom.d) the P-value for  t  7 1.78 with 22 degrees offreedom.

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