Question: Is there an error in experimental design? Because the scientist has a limited budget to buy fertilizer, only the 6 smallest lakes in the area

Is there an error in experimental design?

Because the scientist has a limited budget to buy fertilizer, only the 6 smallest lakes in the area were fertilized with phosphorus and measured the change in chlorophyll concentration over the growing season.Because the change in these lakes is significantly higher (p<0.05) than the change in 6 slightly larger control lakes, the scientist concludes that phosphorus has a significant effect on primary productivity.

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