10.46 Data from the U.S. Department of Interior Geological Survey give flow rates for a small river...

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10.46 Data from the U.S. Department of Interior–

Geological Survey give flow rates for a small river in North Florida. It is of interest to compare flow rates for March and April, two relatively dry months.

Thirty-one measurements for March showed a mean flow rate of 6.85 cubic feet per second and a standard deviation of 1.2. Thirty measurements for April showed a mean of 7.47 and a standard deviation of 2.3. Is there sufficient evidence to say that these two months have different average flow rates, at the 5% significance level?

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