All Questions
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Calculating the probability that the standard deviation is above or below a certain value
I'm given $n$ samples from a random number generator that produces normally distributed values. Can I calculate the probability that the standard deviation that the RNG uses is $\sigma > \sigma_{...
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How to find confidence interval for variance?
Well, I'm taking a statistics class online, and the problem goes like this:
Drug concentrations (measured as a percentage) for 25 randomly selected tablets are shown in the accompanying table. For ...
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Narrow confidence interval for variance
When we have an estimate of the variance $s^2$ obtained from $n$ observations, $x_1, x_2, \dots, x_n$, we can calculate a 95% confidence interval of the true variance
$$\left( \frac{(n-1)s^2}{\chi^2_{...
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Confidence interval for variances
I have a lot of variances $\sigma^2(x)$ as these:
Now I have two task: remove the vertical outliers and compute the confidence intervals (for all cases, this is only one case).
I think that their ...
