The formula used to calculate a confidence interval for the mean of a normal population is x ± (t critical value) s   n. What is the appropriate t critical value for each of the following confidence levels and sample sizes? (Round your answers to two decimal places.)   (a) 95% confidence,  n = 20   (b) 99% confidence,  n = 22   (c) 90% confidence,  n = 11

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