Roller coasters get all 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 75 roller coasters around the world.
![1144_Graph 06.jpg](https://secure.tutorsglobe.com/CMSImages/1144_Graph%2006.jpg)
a) Does the scatterplot indicate that it is appropriate to calculate the correlation? Explain.
b) In fact, the correlation of Speed and Drop is 0.91. Describe the association.