Six randomly selected pea plants ( Pisum sativum) were treated with the plant growth regulator auxin, and six randomly selected plants were not treated. We wish to know if the growth regulator affects internode growth (measured in mm). You can assume the data is normally distributed. Assume that all plants came from populations with equal variances. Take o = 0.05. Treated Plants Untreated Plants 15.2 13.5 12.3 9.8 11.6 10.2 14.8 8.7 10.0 9.2 14.2 9.0