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Question [CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
A study is under way to determine the average height of all 63, 000 adult walnut trees in a certain national forest. The heights of 950 randomly selected adult walnut trees are measured and analyzed. The sample in this study is:
A
the average height of the 950 randomly selected adult walnut trees.
B
the average height of all the adult walnut trees in this forest.
C
all the adult walnut trees in this forest.
D
the 950 adult walnut trees selected at random from this forest.
Explanation: 
There is 1 question to complete.