The experimental group should be calculated to have worms and comparing them with control group as they lack worms. Here the average will be 6cm taller than the plants lack worms.
What is the role of worm in plant growth?
Worm often provide some nutrients by decomposition which favors growth of roots.
This can be noted that after five weeks, the plants growing in soil containing worms grew an average of 6 centimeters taller than the plants in the control group, as shown in data difference in Average Height"
Thus, the plant that grow in soil containing worm grow 6cm taller than the plant grow in soil that lack worm.
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