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What critical value t* would you use for a confidence interval for the population mean in each of the following situations? a)A 95% confidence interval

What critical value t* would you use for a confidence interval for the population mean in each of the following situations?

a)A 95% confidence interval abased on n = 10 randomly selected observations.

b)A 99% confidence interval from an SRS of 20 observations.

c)A 90% confidence interval based on a random sample of 77 individuals.

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