you need n, and then just look up either of those chi-square percentiles
then solve for s.
If, you really don't have n, just go down the tables and see which of those ratio of percentiles
gives you your number 5.0884
If a 90% confidence interval for is reported to be (51.47,261.90), what is the value of the sample standard deviation.
Attempt:
So
and
Then
So this looks like it should have an F-distribution with same numerator and denominator degrees of freedom, which should help me figure out what those degrees of freedom are.
I can't figure out how to do this. Or am I way off?