端同學(xué)
2020-11-03 14:00In a metal fabrication process, metal rods are produced that have an average length of 20.5 metres with a standard deviation of 2.3 metres. A quality control specialist collects a random sample of 30 rods and measures their lengths. 問題：Suppose the resulting sample mean is 19.5 metres. Do you think that this sample result is unusually small? Explain. 答案：We have a random sample of metal rods drawn from a much larger population. A sample mean of only 19.5 metres is about 2.38 standard deviations below what we expect. The sample mean of 19.5 metres is unusually small. 老師我想請問這個(gè)題的答案怎么出來的，2.38這個(gè)數(shù)字怎么來的
所屬：FRM Part I > Quantitative Analysis 視頻位置 相關(guān)試題
來源： 視頻位置 相關(guān)試題
1個(gè)回答
Jenny助教
2020-11-03 18:00
該回答已被題主采納
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