In 2000 a sample of 27 bags of marijuana had a mean thc concentration of 5%, with sample standard deviation…

In 2000 a sample of 27 bags of marijuana had a mean thc concentration of 5%, with sample standard deviation of 1.3%. In 2010, a sample of 34 bags had a mean concentration of 5.1%, with a sample standard deviation of 1.1%. had production become more consistent over time?
 
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