for question d and e?

The mean difference between the two groups (fertilizer and control) is the -0.965.

so thus we can consider 2 explanations for the -0.965 difference

- The fertilizer has no effect on the height of popular trees and diff. of -0.965 was due to chance.
- The diff. of -0.956 arose because fertilizer does have an effect on the height of popular trees.

for d) is it 6!?

and e)6!/3003 = p-value