Chapter 2, Section 5, Exercise 169 Light Roast or Dark Roast for Your Coffee? A

Question

Chapter 2, Section 5, Exercise 169 Light Roast or Dark Roast for Your Coffee? A somewhat surprising fact about coffee is that the longer it is roasted, the less caffeine it has. Thus an ‘‘extra bold” dark roast coffee actually has less caffeine than a light roast coffee. What is the explanatory variable and what is the response variable? The roasting time is the variable. The amount of caffeine is the variable. Do the two variables have a negative association or a positive association? Click if you would like to Show Work for this question: Open Show Work

Explanation / Answer

Explanatory Variable: Roasting Time

Response Variable: Amount of Caffeine

The longer the coffee is roasted, the less caffeine it has. It implies that variables Roasting Time and Amount of Caffeine has negative association between them

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