Suppose a Researcher Was Interested in Effect of Milk on Children's

Suppose a researcher was interested in effect of milk on children's height. The researcher recruited 20,000 schoolchildren and measured their height. They randomly allocated pupils to either receive milk or no milk, but they told teachers that if it appeared that if either the milk or the no milk groups in their classroom appeared to have more well-nourished children, they could even the groups out. After the experiment it was found that the children in the milk condition had grown more (but their average height was still less than the no milk group) . Which of the following is the biggest problem with this study?

A) The sample size is too large.
B) There was a bias in the allocation of participants to conditions.
C) The group that gains the most height must be taller, there were problems in the calculations.
D) The placebo effect.

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