What is the value of ????crit used in a small sample (a) 90% confidence interval for the

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What is the value of ????crit used in a small sample

(a) 90% confidence interval for the mean when the sample size is ???? = 25?

(b) 95% confidence interval for the mean when the sample size is ???? = 30?

(c) 98% confidence interval for the mean when the sample size is ???? = 15?

(d) 99% confidence interval for the mean when the sample size is ???? = 27?

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