Question: Is the standard deviation below 30 seconds? Use the P-Value approach with alpha=0.05. n=150 How do you find the P-Value when you're looking for standard

"Is the standard deviation below 30 seconds? Use the P-Value approach with alpha=0.05. n=150"

How do you find the P-Value when you're looking for standard deviation instead of mean?

I think it has something to do with chi^2, but I don't know the formula/steps.

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