Question

The data in the table present the speed of an automobile (miles per hour) and its...

The data in the table present the speed of an automobile (miles per hour) and its corresponding gasmileage (miles per gallon).

Speed 30 40 50 60 70

Gas-Mileage 24 28 30 28 24

1. Which is the explanatory variable, and which is the response?

2. Make a scatterplot of Mileage vs Speed. (Choose the appropriate scales, and use a ruler for the plot).

3. Is the association between the two variables positive or negative? Explain.

4. Compute the correlation r between Speed and Mileage (provide all the details of the computation).

5. Explain why the correlation is 0 even though the scatterplot shows a strong association between Speed and Mileage

Math   Statistics-And-Probability   
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