Two fertilizers are applied to randomly selected potato plants. After several weeks, the potatoes are weighed. The weights in kilograms are as follows. Which fertilizer is generally more effective?
Fertilizer A: 27, 20, 16, 18, 22, 19, 23, 21, 17, 19
Fertilizer B: 28, 19, 18, 21, 24, 20, 25, 27, 29, 21
a Fertilizer B is generally more effective, because the mean and median weights of the potatoes that were treated with it are higher.
b Fertilizers A and B are both ineffective, because there is no difference in the ranges of the weights of the potatoes.
c Fertilizer A is generally more effective, because the mean and median weights of the potatoes treated with it are higher.
d Fertilizers A and B are equally effective, because the ranges of the weights of the potatoes are the same.