Two sample t-test

:A research scientist is interested in determining whether the addition of a special chemical compound to the soil of a growing plant affects its growth. 2 groups of seven plants each are tested. The special chemical compound is added to the soil of the first group. Nothing special is added to the soil of the other group. All of the plants are then placed in a controlled environment. The heights (in centimeters) of the plants after several months are as follows:

Height of Plants Treated Height of Plants Not Treated

with Special Chemical with Special Chemical

12 11

14 13

19 15

17 16

16 14

15 17

18 16

Using a 5% level of significance, does the addition of the special chemical compound have a significant effect on the plant's growth?