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【单选题】
某大学的一位研究人员希望估计该大学本科生平均每月的生活费支出，为此，他调查了200名学生，得到他们每月平均生活费支出是800元。该研究人员感兴趣的参数是( )。
A.
该大学的所有学生人数
B.
该大学所有本科生月平均生活费支出
C.
该大学所有本科生的月生活费支出总额
D.
所调查的200名学生的平均月生活费支出
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