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【正文】 機(jī)床加工的軸有分析兩臺(tái)機(jī)床加工的軸有無(wú)明顯差異無(wú)明顯差異機(jī)床甲機(jī)床甲 :機(jī)床乙機(jī)床乙 :輸入數(shù)據(jù)于兩列中輸入數(shù)據(jù)于兩列中Twosample T for C1 vs C2n N Mean StDev SE Meann C1 8 n C2 7 n Difference = mu (C1) mu (C2)n Estimate for difference: n 95% CI for difference: (, )n TTest of difference = 0 (vs not =): TValue = PValue = DF = 12n 由于假設(shè)兩均值相等由于假設(shè)兩均值相等 ,差為差為 0,在在 (, )中中 ,故可故可認(rèn)為二者均值無(wú)明顯差異認(rèn)為二者均值無(wú)明顯差異假設(shè)方差未知假設(shè)方差未知 ,判斷兩個(gè)總體的方差是否相等判斷兩個(gè)總體的方差是否相等 ,即尺寸離散度是否相同即尺寸離散度是否相同謝謝觀看 /歡迎下載BY FAITH I MEAN A VISION OF GOOD ONE CHERISHES AND THE ENTHUSIASM THAT PUSHES ONE TO SEEK ITS FULFILLMENT REGARDLESS OF OBSTACLES. BY FAITH I BY FAITH
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