Question: Suppose the annual maximum stream flow of a given river has been observed for 10 years yielding the following statistics: Sample mean: 10 m/h

Suppose the annual maximum stream flow of a given river has been observed for 10 years yielding the following statistics: Sample mean: 10 m/h Sample variance: 9x10 (m\h) (a) Establish the two-sided 90% confidence interval on the mean annual maximum stream flow. Assume a normal population. (b) If the desired to estimate the mean annual maximum stream flow to within +30000 m/h with 90% confidence, how many additional years of observation will be require? Assume the sample variance based on the new set of data will be approximately 9x108 (m\h).

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