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The BOD (water pollution detecting data) of 19 places in middle basin of each of the...

The BOD (water pollution detecting data) of 19 places in middle basin of each of the five rivers was investigated. Similar surveys have been conducted every year for the last 20 years. We want to examine whether there is a change in pollution in any river compared to the value 20 years ago. What statistical method should be used? Also, why?

(To be specific: Does the problem require multiple comparisons? If so, which method is appropriate?)

Math   Statistics-And-Probability   
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