inmagine_ling
幼苗
共回答了21个问题采纳率:95.2% 举报
e.
SE(标准误差)=10/(根号下40)=1.58
查t-table表,95% confident 的情况下,t-value for (40-1)=39,也就是30的是3.030
magin of error=1.58*3.030=4.7874
so, 95% confidence interval for population mean is (369-4.7874, 369+4.7874) = (354.21,373.78)
f.
The manufacturer's claim is not correct, 365g is in the 95% confidence interval. The mean of the samples just should be around 365g which is not always larger thanwhat they have specified in the box.
e就是说让你求出一个mean的区间,包含的95%的sample的mean.也就是说,任意抽一组sample,你能95%确定它的mean落在这个区间里.
f是说让你评论一下制造商的话,制造商说mean是总是大于365g,这个数字在区间中间部分,所以他这个说法是不准确的.恩.
f里还提到了g?你没写我就不知道是什么了.
不保证对,我找不到书了.我也解释不好,好几章的内容呢,大致意思肯定没错,你再查查资料吧.
附,google搜的t-table表.
1年前
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