Please no written by hand solution A 95% confidence interval provides a range of numbers around a mean that we are 95% certain contains the "true" value. For example, if we have a mass of rock being 5.44 g with a 95% confidence interval of ±0.20 g, we are 95% confident the actual mass of the rock lies within 5.24 and 5.64 g. What is corresponding level of confidence for a simple standard deviation?
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