Environmentalists concerned about global warming

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Reference no: EM131816793

Environmentalists concerned about global warming can take a variety of approaches to produce evidence that temperatures are on the rise. Which one of these designs involves a categorical explanatory variable and a quantitative response?

a. Record the mean global temperature for each year over the past century.

b. Record the mean global temperature over the past 25 years and compare it to the mean global temperature for the previous 75 years.

Reference no: EM131816793

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