估計(jì)有多少百分比的數(shù)據(jù)是在是在兩個(gè)平均標(biāo)準(zhǔn)差之內(nèi)
1.先計(jì)算平均值(mean):(31+31+42+39+42+43+34+30+28+36+37+35+40)/13=36
2.計(jì)算變異量/方差(variance):即(數(shù)據(jù)值-平均值)^2 以第一個(gè)為例:31-36 = -5 然後平方之 = 25
25 25 36 9 36 49 4
36 64 0 1 1 16
3.計(jì)算平均標(biāo)準(zhǔn)差(SD):
a把所有方差(variance) 的總和開方(sqrt)
b方差總和是 25+25+36+9+36+49+4+36+64+0+1+1+16 = 302
c開方(sqrt)302= 17.38
d再把開方結(jié)果除13(學(xué)生數(shù)):17.38/13= 1.34,1.34就是平均標(biāo)準(zhǔn)差(standard deviation)
4兩個(gè)平均標(biāo)準(zhǔn)差之內(nèi)的數(shù)值為:(36-2X1.34)和(36+2X1.34)之間,即33.32到38.68之間
合符的有34 36 37 35 四個(gè)
計(jì)算答案百分比:4/13*100% = 30.76%
英語的統(tǒng)計(jì)學(xué)問題,有關(guān)標(biāo)準(zhǔn)差、平均值
英語的統(tǒng)計(jì)學(xué)問題,有關(guān)標(biāo)準(zhǔn)差、平均值
A group of 13 students is studying in Istanbul,Turkey,for five weeks.As part of their study of the local
economy,they each purchased an Oriental rug and arranged for its shipment back to the United States.The
shipping time,in days,For each rug was
31 31 42 39 42 43 34
30 28 36 37 35 40
Estimate the percentage of days that are within two standard deviations of the Mean.Is it likely to take 2
months for a delivery?
Estimate the percentage of days that are within two standard deviations of the Mean.
請(qǐng)寫出具體的計(jì)算步驟
A group of 13 students is studying in Istanbul,Turkey,for five weeks.As part of their study of the local
economy,they each purchased an Oriental rug and arranged for its shipment back to the United States.The
shipping time,in days,For each rug was
31 31 42 39 42 43 34
30 28 36 37 35 40
Estimate the percentage of days that are within two standard deviations of the Mean.Is it likely to take 2
months for a delivery?
Estimate the percentage of days that are within two standard deviations of the Mean.
請(qǐng)寫出具體的計(jì)算步驟
英語人氣：265 ℃時(shí)間：2020-03-22 11:14:45
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