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When n is large the statistic s is approximately unbiased

When n is large, the statistic s is approximately unbiased for estimating s and has approximately a normal distribution. The standard deviation of this statistic when the

population distribution is normal is

which can be estimated by

9.9 to obtain a 95% confidence interval for the true standard deviation of waiting time for angiography.

population distribution is normal is

which can be estimated by

9.9 to obtain a 95% confidence interval for the true standard deviation of waiting time for angiography.

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