题目内容
It is impolite to ____ with food in your mouth.
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You should wait for your food to cool off, but not ____ if it is too hot to eat. No ____ while you are eating.
If you have to leave the table during a meal, say “_____” or “_____”.
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
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