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Find the critical value, t, which you multiply by the standard error to calculate the...

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Find the critical value, t, which you multiply by the standard error to calculate the confidence interval for mu.(a) 90% confidence interval for a mean with 7 observations.t =(b) 95% confidence interval for a mean with 12 observations.t =(c) 99% confidence interval for a mean with 21 observations.

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