Estimating with Confidence: Estimating a population mean

10.37 What critical vaue t* from Table C would you use for a confident interval for the mean of the population in each of the following situation?

(a) A 95% confident interval based on n=10 observations.

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

(c) n 50% confident interval from a sample of size 7.

I seriously dont know what step I should start off whith to begin with


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