2022英语周报高二SDL答案

One possible versionThe Most Beautiful Place in My HeartAs a 17-year-ol teenager, I ve been to many great cities, among which Luoyang is the most beautiful one inlocated on the north bank of the luo river in western Henan pruvinee l aovany is surrounded by mountains on threesidles, high in the west and low in the east. At the end of 2019, Luoyang had a population of more than 7. I millionI love Luoyang so much due to the fact that as one of the four ancient capitals of China, Luoyang has a civilizationhistory of 5, 000 years. Whats more, the number of its heritage sites is second only to Beijing in cities of China. And itfamous tourist attractions inelude Lungmen Grottoes, Baima Temple, Guanlin and so on

22.解:(1)由样本数据得(x;,t)(i=1,2,…,16)的相关(x;-x)(i-8.5)系数为r=2.780.18.0.212×√16×18.439由于|r|<0.25,因此可以认为这一天生产的零件尺寸不随生产过程的进行而系统地变大或变小(4分)(2)①由于x=9.97,s≈0.212,由样本数据可以看出抽取的第13个零件的尺寸在(x-3s,x+35)以外,因此需对当天的生产过程进行检查分)剔除离群值,即第13个数据,剩下数据的平均数为1g×(16×9.97-9.22)=10.0这条生产线当天生产的零件尺寸的均值的估计值为10.02x2=16×0.2122+16×9.972≈1591.134剔除第13个数据,剩下数据的样本方差为15×(1591.134-9.222-15×10.02)≈0.008,这条生产线当天生产的零件尺寸的标准差的估计值为√0.008≈0.09(12分)

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