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What critical value t should be used for a confidence interval for the mean of the population in each of the following situations? A) A

What critical value t should be used for a confidence interval for the mean of the population in each of the following situations? A) A 90% confidence interval based on n=12 observations. B) A 95% confidence interval from an SRS of 30 observations. C) An 80% confidence interval from a sample of size 18

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