21. Roller coasters 2014 Most roller coasters get their speed by dropping down a steep initial incline, so it makes sense that the height of that drop might be related to the speed of the coaster. Here’s a scatterplot of top Speed and largest Drop for 108 roller coasters around the world.

a) Does the scatterplot indicate that it is appropriate to calculate the correlation? Explain.

b) In fact, the correlation of Speed and Drop is 0.937. Describe the association.

120 10 100 60 80 Speed (mph) 80 80- 40 + 100 200 300 400 Drop (1)