Question: Measurement errors when using two different instruments are more or less symmetrically distributed and are believed to be reasonably well approximated by a normal distribution.

Measurement errors when using two different instruments are more or less symmetrically distributed and are believed to be reasonably well approximated by a normal distribution. Ten measurements with each show a sample standard deviation three times as large with one instrument as with the other. Give an interval in which you are 99% sure that the ratio of the true standard deviations lies.

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