统计量与抽样分布太行之路网站欢迎您

§3.2统计量与抽样分布统计量的定义是不是例12.

几个常用统计量(样本矩)的定义(1)样本均值(2)样本方差它反映了总体均值的信息它反映了总体方差的信息(乔3欣)样佣本津标本准寄差(蜡4奸)样烘本k阶绑(读原侧点境)眯矩(蝴5中)样急本k阶胳中搅心方矩2窗.困2距抽乐样拳分煤布统计量是n维随机变量的函数，作为一个随机变量，它也有自己的概率分布。通常把统计量的分布称为抽样分布。设绢总诊体X的适分目布私函鞭数惊已旱知踩，西如稻果跳对怎任矿意潮容膜量侧为n的僵样诵本板，意能腹求垒出背给刻定筹的思统叙计悼量壶的残分输布圆函衫数邻，风则慢称蓬该扩分腐布博函早数促为爱的精店确膀分许布桑。1各．均样另本件均史值往的栋分寺布正利态肺总鲁体院的貌几调个府统响计较量纽奉的娃精痕确绑分萝布2夹．逮分设布3摔．t分蛛布4心．F分废布1狐.湿样纱本史均帝值默的肤分守布设，是来自总体X的样本，由于正态变量的线性函数仍为正态变量，故

，通拢常利称世为总岭体亦的签标栏准始误撑差，记氧作标惹准刚正司态具分姜布负的杏上堆侧污临交界翁值标俘准轨正咸态礼分早布蚊的崖双赤侧垮临爬界备值yxo图3-3yxo图3-42摊．岭分妇布分突布箱的上妄侧行临掌界枝值图3-6oyx定称理艘１设勇是犯来惩自想正赶态鞭总漆体的撤样分本蝴，习则1o样哲本誉均海值沉与贵样轿本如方庙差念相党互叶独套立石；2o性由质1(户此置性吨质相可狐以弦推软广锅到前多羊个鸦随欺机并变尤量分的辽情财形押)t分刘布躬又子称学臭生绍氏(S曲t从u授d躲e职n鸦t)分侧布.学定生钱氏姿资竟料2.当n充镜分粮大敏时缓,竞其泼图尾形康类闷似拉于芬标撤准吴正浇态恰变补量棉概脚率侮密青度睡的淘图榴形漫.定堪理嘱2设秩是鸦来螺自救正狸态氏总矮体的列样袍本载，筋则责统蒙计辞量定个理车3设液和欠是驾来贡自正农态要总迎体掩和老的雀样讨本六，跨，劈燕且劲两纯者锡相吉互腔独魔立素，淹则滚统侵计感量和

分别为两个总体的样本方差

称饱为谅样愉本撇均茎值苏差宏的礼标汉准想误割，记足作申，宁即膜。分忘布惹的筑上译侧禾临源界备值分什布售的短双煮侧溜临杆界否值yxo图芒3失-揉8yxo图陆3树-贷9服办从第掌一录自悼由店度为岔，第虫二艇自软由黑度为合的暑分猫布蛋，嫁记县作3嫩.F分展布定莫义F分肯布生的上狠侧覆临止界畅值是昂指锐满依足萝下猪式端的定理４设，是正态总体的样本容量和样本方差；，是正态总体的样本容量和样本方差，且两个样本相互独立，则统计量附古表泻2注-锻1标够准新正赠态百分僚布跪表z0.000.010.020.030.040.050.060.070.080.090.00.10.20.30.40.50.60.70.80.91.01.11.21.31.41.51.60.50000.53980.57930.61790.65540.69150.72570.75800.78810.81590.84130.86430.88490.90320.91920.93320.94520.50400.54380.58320.62170.65910.69500.72910.76110.79100.81860.84380.86650.88690.90490.92070.93450.94630.50800.54780.58710.62550.66280.69850.73240.76420.79390.82120.84610.86860.88880.90660.92220.93570.94740.51200.55170.59100.62930.66640.70190.73570.76730.79670.82380.84850.87080.89070.90820.92360.93700.94840.51600.55570.59480.63310.67000.70540.73890.77030.79950.82640.85080.87290.89250.90990.92510.93820.94950.51990.55960.59870.63680.67360.70880.74220.77340.80230.82890.85310.87490.89440.91150.92650.93940.95050.52390.56360.60260.64060.67720.71230.74540.77640.80510.83150.85540.87700.89620.91310.92780.94060.95150.52790.56750.60640.64430.68080.71570.74860.77940.80780.83400.85770.87900.89800.91470.92920.94180.95250.53190.57140.61030.64800.68440.71900.75170.78230.81060.83650.85990.88100.89970.91620.93060.94300.95350.53590.57530.61410.65170.68790.72240.75490.78520.81330.83890.86210.88300.90150.91770.93190.94410.95451康.慌6冷4悼5附满表燃2府-傲2标熔准筝正喉态灭分该布怨表z0.000.010.020.030.040.050.060.070.080.091.61.71.81.92.02.12.22.32.42.52.62.72.82.93.00.94520.95540.96410.97130.97720.98210.98610.98930.99180.99380.99530.99650.99740.99810.99870.94630.95640.96480.97190.97780.98260.98640.98960.99200.99400.99550.99660.99750.99820.99900.94740.95730.96560.97260.97830.98300.98680.98980.99220.99410.99560.99670.99760.99820.99930.94840.95820.96640.97320.97880.98340.98710.99010.99250.99430.99570.99680.99770.99830.99950.94950.95910.96710.97380.97930.98380.98710.99040.99270.99450.99590.99690.99770.99840.99970.95050.95990.96780.97440.97980.98420.98780.99060.99290.99460.99600.99700.99780.99840.96980.95150.96080.96860.97500.98030.98460.98810.99090.99310.99480.99610.99710.99790.99850.99980.95250.96160.96930.97560.98080.98500.98840.99110.99320.99490.99620.99720.99790.99850.99990.95350.96250.97000.97620.98120.98540.98870.99130.99340.99510.99630.99730.99800.99860.99990.95450.96330.97060.97670.98170.98530.98900.99160.99360.99520.99640.99740.99810.99861.00001米.宾9深6附周表捏4棒-慢1=0.250.100.050.0250.010.005123456789101112131415161.3232.7734.1085.3856.6267.8419.03710.21911.38912.54913.70114.84515.98417.11718.24519.3692.7064.6056.2517.7799.23610.64512.01713.36214.68415.98717.27518.54919.81220.06422.30723.5423.8415.9917.8159.48811.07112.59214.06715.50716.91918.30719.67521.02622.36223.68524.99626.2965.0247.3789.34811.14312.83314.44916.01317.53519.02320.48321.92023.33724.73626.11927.48828.8456.6359.21011.34513.27715.08616.81218.47520.09021.66623.20924.72526.21727.68829.14130.57832.0007.87910.59712.83814.86016.75018.54820.27821.95523.58925.18826.75728.29929.89131.31932.80134.267分略布亡表1膊7睬.预5容3涝5=0.9950.990.9750.950.900.75123456789101112131415160.0100.0720.2070.4120.6760.9891.3441.7352.1562.6033.0743.5654.0754.6015.1420.0200.1150.2970.5540.8721.2391.6462.0882.5583.0533.5714.1074.6605.2295.8120.0010.0510.2160.4840.8311.2371.6902.1802.7003.2473.8164.4045.0095.6296.2626.9080.0040.1030.3520.7111.1451.6352.1672.7333.3253.9404.5755.2265.8926.5717.2617.9620.0160.2110.5841.0641.6102.2042.8333.4904.1684.8655.5786.3047.0427.7908.5479.3120.1020.5751.2131.9232.6753.4554.2555.0715.8996.7377.5848.4389.29910.16511.03711.9123倾.挎2燥4日7附遥表议4滑-2分帐布抵表=0.250.100.050.0250.010.0051718192021222324252627282930313220.48921.60522.71823.82824.93526.03927.14128.24129.33930.43531.52832.62033.71134.80035.88736.97324.76925.98927.20428.41229.61530.81332.00733.19634.38235.56336.74137.91639.08740.25641.42242.58527.58728.86930.14431.41032.67133.92435.17236.41537.65238.88540.11341.33742.55743.77344.98546.19430.19131.52632.85234.17035.47936.78138.07639.36440.64641.92343.19444.46145.71246.97948.23249.48033.40934.80536.19137.56638.93240.28941.63842.98044.31445.64246.96348.27849.58850.89252.19153.48635.71837.15638.58239.99741.40142.79644.18145.55946.92848.29049.64550.99352.33653.67255.00356.3283失4淡.拐3德8画2附娱表魄4具-3分勉布方表附拿表沈3蹈-虚1=0.250.100.050.0250.010.005123456789101112131415161.00000.81650.76490.74070.72670.71760.71110.70640.70270.69980.69740.69550.69380.69240.69120.69013.07771.88561.63771.53321.47591.43981.41491.39681.38301.37221.36341.35621.35021.34501.34061.33686.31382.92002.35342.13182.01501.94321.89461.85951.83311.81251.79591.78231.77091.76131.75311.745912.70624.30273.18242.77642.57062.44692.36462.30602.26222.22812.20102.17882.16042.14482.13152.119931.82076.96464.54073.74693.36493.14272.99802.89652.82142.76382.71812.68102.65032.62452.60252.583563.65749.92485.84094.60414.03223.70743.49953.35543.24983.16933.10583.05453.01232.97682.94672.9208分套布呀表1骡.杏8急1玩2需5附筝表公3蕉-捷2=0.250.100.050.0250.010.005123456789101112131415161.00000.81650.76490.74070.72670.71760.71110.70640.70270.69980.69740.69550.69380.69240.69120.69013.07771.88561.63771.53321.47591.43981.41491.39681.38301.37221.36341.35621.35021.34501.34061.33686.31382.92002.35342.13182.01501.94321.89461.85951.83311.81251.79591.78231.77091.76131.75311.745912.70624.30273.18242.77642.57062.44692.36462.30602.26222.22812.20102.17882.16042.14482.13152.119931.82076.96464.54073.74693.36493.14272.99802.89652.82142.76382.71812.68102.65032.62452.60252.583563.65749.92485.84094.60414.03223.70743.49953.35543.24983.16933.10583.05453.01232.97682.94672.92082住.需1届3弱1昼5分特布项表附捎表壤5喇-它1分杂布爹表

1234567891012152024304012012345678910111213141516171819647.838.5117.4412.2210.018.818.077.577.216.946.726.556.416.306.206.126.045.955.92799.539.0016.0410.658.437.266.546.065.715.465.265.104.974.864.774.694.624.564.51864.239.1715.449.987.766.605.895.425.084.834.634.474.354.244.154.084.013.953.90899.639.2515.109.607.396.235.525.504.724.474.284.124.003.893.803.733.663.613.56921.839.3014.889.367.155.995.294.824.484.244.043.893.773.663.583.503.443.383.33937.139.3314.739.206.985.825.124.654.234.073.883.733.603.503.413.343.283.223.17948.239.3614.629.076.855.704.994.534.203.953.763.613.483.383.293.223.163.103.05956.739.3714.548.986.765.604.904.434.103.853.663.513.393.293.203.123.063.012.96963.339.3914.478.906.685.524.824.364.033.783.593.443.313.213.123.052.982.932.88968.639.4014.428.846.625.464.764.303.963.723.533.373.253.153.062.992.922.872.82976.739.4114.348.756.525.374.674.203.873.623.433.283.153.052.962.892.822.772.72984.939.4314.258.666.435.274.574.103.773.523.333.183.052.952.862.792.722.672.62993.139.4514.178.566.335.174.474.003.673.423.233.072.952.842.762.682.622.562.51997.239.4614.128.516.285.124.423.593.613.373.173.022.892.792.702.632.562.502.45100139.4614.088.466.235.074.363.893.563.313.122.962.842.732.642.572.502.442.39100639.4714.048.416.185.014.313.843.513.263.062.912.782.672.592.512.442.382.33101439.4913.958.316.074.904.203.733.393.142.942.792.662.552.462.382.322.262.20101839.5013.908.266.024.854.143.673.333.082.882.722.602.492.402.322.252.192.134秆.灭9经0

1234567891015202430406012012345678910111213141516171819161.418.5110.137.716.615.995.595.323.124.964.844.754.674.604.544.494.454.414.38199.519.009.556.945.795.144.744.464.264.103.983.893.813.743.683.633.595.553.52215.719.169.286.595.414.764.354.073.813.713.593.493.413.343.293.243.203.163.13224.619.259.126.395.194.534.123.843.633.483.363.263.183.113.063.012.962.932.90230.219.309.016.265.054.393.973.693.48

3.333.203.113.032.962.902.852.812.772.74234.019.338.946.164.954.283.873.583.373.223.093.002.922.852.792.742.702.662.63236.819.358.896.094.884.213.793.503.293.143.012.912.832.762.712.662.612.582.54238.919.378.856.044.824.153.733.443.233.072.952.852.772.702.642.592.552.512.4824.0519.388.816.004.774.103.683.393.183.022.902.802.712.652.592.542.492.462.42241.919.408.795.964.744.063.643.353.142.982.852.752.672.602.542.492.452.412.38245.919.438.705.864.623.942.513.223.012.