统计学习题及答案 3页

11151621223131.5230212245123456150016001650185060062063066022232003-2008200320042005200620072008%20001103104001059312415%10%520093200201046009%63.5%15%7480/5050-5454-5858-6262-6666-70701040150170752015480195%27095%81003/3\n工作是否正常。某日开工后测得9包重量如下：99.398.7100.5101.298.3（a=0.05）99.799.5102.1100.5已知包重服从正态分布，试检验该日打包机工作是否正常。答案1、平均人数=（230*15+212*6+245*10）/31=231劳动生产率=31.5/231=0.1370（万元/人）2季度月平均人数型620630色022=627（人）2、⑴第2季度各月人均销售额月份3月4月5月6月销售额（万元）1500160016501850月末职工人数（人）600620630660月平均人数（人）610625645月均销售额（万兀）2.622.642.873/33/32季度人均销售额二160016501850=8.13（万元）627（3）2季度月平均（1600+1650+1850Z人均销售额3=2.71（万元）6273、平均增长量Yn-丫。_2343.6-2000n5=68.72（万吨）5[2343.6\2000-1=3.22%4、1.15X1.1-1=1.265-1=0.265销售额增长26.5%5、零售额指数=4600/3200X100%=143.75%销售量指数=1.4375/1.09=131.88%6、结构影响指数=103.5%/115%=90%职工人数结构影响使平均工资下降10%7、解：已知n=480,1-:=95%,Z：/2=1.96根据样本数据计算得：浮=嚮=59.17（英里/小时）3/3\n'(x-x)2f2=4.73(3/31卩1-o(x_Z-2S—=59.17_1.964.73jn<480=59.17_0.42=(58.75,59.59)9558.75~59.592n=480p15/480=3.1%np5zot/2=1.96p亠一P(—P)=3.1%一1.96卫1%—3.1%)◎nV480=3.1%_1.55%F1.55%,4.65%701.55%~4.65%8H0:卩=100H1:心100:-=0.05df=9-1=8t0.025(8)=2.3646二Xix99.98n忆(x「x)2s：、=1.2122\n-1x-%99.98-100t0.049sn1.2122.9a=0.05H03/3