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1.A sample of 20 random Observations produced a mean of 145 and a variance of 30. What are the 95% confidence intervals on the mean

1.A sample of 20 random Observations produced a mean of 145 and a variance of 30. What are the 95% confidence intervals on the mean assuming a normal distribution if (a) the true variance is estimated by 30; (b) the true variance is 30. What are the 90% confidence intervals on the variance for the samples. Use tables or any online calculator

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