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For parts a and b, use technology to estimate the following. a) The critical value of t for a 98% confidence interval with df = 3. b) The critical value of t for a 99% confidence interval with df = 112. ..... a) What is the critical value of t for a 98% confidence interval with df = 3? (Round to two decimal places as needed.) b) What is the critical value of t for a 99% confidence interval with df = 112? (Round to two decimal places as needed.)