问答题

从某一班中随机抽取了16名女生进行调查.她们平均每个星期花费130元吃零食,样本标准差为30元,求

此班所有女生每个星期平均花费在吃零食上的钱数的95%的置信区间。(假设总体服从正态分布)

答案：为了计算总体平均数的95%置信区间，我们可以使用以下公式：\[ \bar{x} \pm Z_{\frac{\alpha}...

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