Mathematics, 30.03.2020 17:50 emmadownum
The waiting times for the treatment of a specialized steel are assumed to be normally distributed, with unknown mean and standard deviation. As an enterprising co-op student, you perform 25 tests. Find an interval bracketing the probability that you will observe a standard deviation in waiting time exceeding 5 minutes when the true standard deviation is (a) 4.3 minutes or (b) 6.0 minutes.
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