9.02 Is this a completely randomized design?
A biology student wants to determine if using a fertilizer
would help promote the growth of new babies in spider
plants. The student chooses 100 baby spider plants to
be used in the study. They all are potted in the same
amount and type of soil, given the same amount of
water, and exposed to the same amount of light. Half of
the plants are randomly assigned to the group that
receives fertilizer every three months and the remaining
plants are assigned to the group that does not receive
fertilizer. After one year, the shoots are counted for
each plant. The average number of shoots for the
plants receiving fertilizer is compared with the average
number of shoots for the plants that did not receive
fertilizer.
O Yes, the plants were randomly assigned each
treatment.
Yes, the plants received the same amount of soil,
water, and light.
O No, only spider plants were used.
No, the plants did not all receive the same
treatment.
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