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Ten observations have sample standard deviation $2$ . What is the half-width of a $95\%$ confidence interval for the mean, using the $t$ distribution with $9$ degrees of freedom ( $t = 2.262$ )? Give three decimals.

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Confidence intervals, and the interval you would trade

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Citadel, Two Sigma

Ten observations have sample standard deviation 222. What is the half-width of a 95%95\%95% confidence interval for the mean, using the ttt distribution with 999 degrees of freedom (t=2.262t = 2.262t=2.262)? Give three decimals.

More statistics and inference questions

Ten observations have sample standard deviation $2$ . What is the half-width of a $95\%$ confidence interval for the mean, using the $t$ distribution with $9$ degrees of freedom ( $t = 2.262$ )? Give three decimals.