6. How fast do icicles grow? Here are data on two variables, Time measured in minutes and Length measured in centimeters, for one set of conditions: no wind, temperature −11∘C, and water flowing over the icicle at 12 milligrams per second.
| Time (minutes) | 10 | 20 | 30 | 40 | 50 |
| Length (centimeters) | 0.6 | 1.8 | 2.9 | 4.0 | 5.0 |
| Time (minutes) | 60 | 70 | 80 | 90 | 100 |
| Length (centimeters) | 6.1 | 7.9 | 10.1 | 10.9 | 12.7 |
| Time (minutes) | 110 | 120 | 130 | 140 | 150 |
| Length (centimeters) | 14.4 | 16.6 | 18.1 | 19.9 | 21.0 |
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Which is the explanatory variable? Make a scatterplot. Describe in words the direction, form, and strength of the relationship.