If you have to leave the table during a meal, say “_____” or “_____”.
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When you finish your meal, place _____ onto your plate together, on the right side, pointed down.
从一个正太总体中随机抽取n=20的一个随机样本,样本均值为17.25,样本标准差为3.3。则总体均值μ的95%的置信区间为
A. (15.97, 18.53)
B. (15.71, 18.79)
C. (15.14, 19.36)
D. (14.48, 20.45)
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