Question

Researchers analyzed 12 samples of two kinds of Stella's decaffeinated coffee. The caffeine in a cup of decaffeinated espresso had a mean of 9.4 mg with a standard deviation of 3.2 mg, while brewed decaffeinated coffee had a mean of 12.7 mg with a standard deviation of 0.35 mg. Assuming unequal population variances, is there a significant difference in caffeine content between these two beverages at α = .01?


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  • CreatedAugust 19, 2015
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