Disk drives have been getting larger. Their capacity is now often given in terabytes (TB) where 1 TB = 1000 gigabytes, or about a trillion bytes. A search of prices for external disk drives on Amazon.com in early 2014 found the following data:
Capacity (in TB) Price (in $)
0.50 …………………………… 59.99
1.0 …………………………… 79.99
2.0 …………………………… 111.97
3.0 …………………………… 109.99
4.0 …………………………… 149.99
6.0 …………………………… 423.34
8.0 …………………………… 596.11
12.0 …………………………… 1079.99
32.0 …………………………… 4461.00
a) Prepare a scatterplot of Price against Capacity.
b) What can you say about the direction of the association?
c) What can you say about the form of the relationship?
d) What can you say about the strength of the relationship?
e) Does the scatterplot show any outliers?