A: 提高[img=17x22]1803b3202a4595b.png[/img]，提高[img=17x22]1803b320329e5d6.png[/img]
B: 提高[img=17x22]1803b3202a4595b.png[/img]，降低[img=17x22]1803b320329e5d6.png[/img]
C: 降低[img=17x22]1803b3202a4595b.png[/img]，提高[img=17x22]1803b320329e5d6.png[/img]
D: 降低[img=17x22]1803b3202a4595b.png[/img]，降低[img=17x22]1803b320329e5d6.png[/img]
举一反三
- 一卡诺热机，高温热源的温度为[img=17x22]1803b31f7ef31f6.png[/img]，低温热源的温度为[img=17x22]1803b31f86e5b35.png[/img]。要提高热机效率，可以通过（ ）来实现。 A: 提高[img=17x22]1803b31f8ef83e9.png[/img] B: 提高[img=17x22]1803b31f975f87e.png[/img] C: 降低[img=17x22]1803b31f8ef83e9.png[/img] D: 降低[img=17x22]1803b31f975f87e.png[/img]
- 设总体X的分布律为P(X=0)=θ, P(X=1)=P(X=2)=(1-θ)/2，其中0<θ<1为待估未知参数。设[img=101x23]1802d3c6e1c13c2.png[/img]是简单随机样本。令[img=114x27]1802d3c6e985317.png[/img],[img=17x22]1802d3c6f1a9682.png[/img]为[img=101x23]1802d3c6e1c13c2.png[/img]中0所占的比例, 则以下哪个说法正确的？ A: [img=17x22]1802d3c702e42ee.png[/img]比[img=17x22]1802d3c70bb0618.png[/img]更有效 B: [img=17x22]1802d3c70bb0618.png[/img]和[img=17x22]1802d3c702e42ee.png[/img]都是[img=9x19]1802d3c72407a68.png[/img]的相合估计 C: [img=17x22]1802d3c70bb0618.png[/img]比[img=17x22]1802d3c702e42ee.png[/img]更有效 D: [img=17x22]1802d3c70bb0618.png[/img]是相合估计, [img=17x22]1802d3c702e42ee.png[/img]不是相合估计 E: [img=17x22]1802d3c70bb0618.png[/img]不是相合估计, [img=17x22]1802d3c702e42ee.png[/img]是相合估计 F: [img=17x22]1802d3c70bb0618.png[/img]， [img=17x22]1802d3c702e42ee.png[/img]都不是相合估计 G: [img=242x46]1802d3c7710420a.png[/img]
- 设X1，X2，X3是来自总体X的简单随机样本，则下列统计量[img=551x43]1803da166a9817a.png[/img]中, 是总体均值的无偏估计量. A: [img=17x22]1803da167310a8f.png[/img]和[img=17x22]1803da167bae41e.png[/img] B: [img=17x22]1803da168407eae.png[/img]和[img=17x22]1803da168b8a567.png[/img] C: [img=17x22]1803da167bae41e.png[/img]和[img=17x22]1803da168b8a567.png[/img] D: [img=17x22]1803da167310a8f.png[/img]，[img=17x22]1803da167bae41e.png[/img]和[img=17x22]1803da168b8a567.png[/img]
- 设X1，X2，X3是来自总体X的简单随机样本，则下列统计量[img=551x43]18033806cb7d6a4.png[/img]中, 是总体均值的无偏估计量. A: [img=17x22]18033806d402a81.png[/img]和[img=17x22]18033806dc38d57.png[/img] B: [img=17x22]18033806e4e5857.png[/img]和[img=17x22]18033806eda0c27.png[/img] C: [img=17x22]18033806dc38d57.png[/img]和[img=17x22]18033806eda0c27.png[/img] D: [img=17x22]18033806d402a81.png[/img]，[img=17x22]18033806dc38d57.png[/img]和[img=17x22]18033806eda0c27.png[/img]
- 设X1，X2，X3是来自总体X的简单随机样本，则下列统计量[img=551x43]1803da1393f5fdf.png[/img]中, 是总体均值的无偏估计量. A: [img=17x22]1803da139b3128e.png[/img]和[img=17x22]1803da13a44f014.png[/img] B: [img=17x22]1803da139b3128e.png[/img]和[img=17x22]1803da13b5b84de.png[/img] C: [img=17x22]1803da13a44f014.png[/img]和[img=17x22]1803da13b5b84de.png[/img] D: [img=17x22]1803da13d1416f1.png[/img]，[img=17x22]1803da13a44f014.png[/img]和[img=17x22]1803da13b5b84de.png[/img]
内容
- 0
设X1，X2，X3是来自总体X的简单随机样本，则下列统计量[img=551x43]18035733a7a3c92.png[/img]中, 是总体均值的无偏估计量. A: [img=17x22]18035733b1e4eac.png[/img]和[img=17x22]18035733badf839.png[/img] B: [img=17x22]18035733c3a1aec.png[/img]和[img=17x22]18035733cbc1913.png[/img] C: [img=17x22]18035733badf839.png[/img]和[img=17x22]18035733cbc1913.png[/img] D: [img=17x22]18035733b1e4eac.png[/img]，[img=17x22]18035733badf839.png[/img]和[img=17x22]18035733cbc1913.png[/img]
- 1
设X1，X2，X3是来自总体X的简单随机样本，则下列统计量[img=551x43]1803da11a68b020.png[/img]中, 是总体均值的无偏估计量. A: [img=17x22]1803da11b0fe561.png[/img]和[img=17x22]1803da11ba86065.png[/img] B: [img=17x22]1803da11c3301fe.png[/img]和[img=17x22]1803da11cc3e764.png[/img] C: [img=17x22]1803da11ba86065.png[/img]和[img=17x22]1803da11cc3e764.png[/img] D: [img=17x22]1803da11b0fe561.png[/img]，[img=17x22]1803da11ba86065.png[/img]和[img=17x22]1803da11cc3e764.png[/img]
- 2
若岩石的压缩系数为1×10[img=17x22]18031a731f338dd.png[/img]MPa[img=17x22]18031a73280a57a.png[/img]，水的压缩系数为4×10[img=17x22]18031a731f338dd.png[/img]MPa[img=17x22]18031a73280a57a.png[/img]，油的压缩系数为10×10[img=17x22]18031a731f338dd.png[/img]MPa[img=17x22]18031a73280a57a.png[/img]，束缚水饱和度为0.3，则油藏流体的压缩系数为 A: 14×10[img=17x22]18031a735205d75.png[/img]MPa[img=17x22]18031a735b013a1.png[/img] B: 8.2×10[img=17x22]18031a735205d75.png[/img]MPa[img=17x22]18031a735b013a1.png[/img] C: 15×10[img=17x22]18031a735205d75.png[/img]MPa[img=17x22]18031a735b013a1.png[/img] D: 6×10[img=17x22]18031a735205d75.png[/img]MPa[img=17x22]18031a735b013a1.png[/img]
- 3
若岩石的压缩系数为1×10[img=17x22]18032b90b424a6e.png[/img]MPa[img=17x22]18032b90bc7a91c.png[/img]，水的压缩系数为4×10[img=17x22]18032b90b424a6e.png[/img]MPa[img=17x22]18032b90bc7a91c.png[/img]，油的压缩系数为10×10[img=17x22]18032b90b424a6e.png[/img]MPa[img=17x22]18032b90bc7a91c.png[/img]，束缚水饱和度为0.3，则油藏容积的压缩系数为 A: 14×10[img=17x22]18032b90e703205.png[/img]MPa[img=17x22]18032b90ef2949b.png[/img] B: 8.2×10[img=17x22]18032b90e703205.png[/img]MPa[img=17x22]18032b90ef2949b.png[/img] C: 15×10[img=17x22]18032b90e703205.png[/img]MPa[img=17x22]18032b90ef2949b.png[/img] D: 6×10[img=17x22]18032b90e703205.png[/img]MPa[img=17x22]18032b90ef2949b.png[/img]
- 4
若岩石的压缩系数为1×10[img=35x22]18032b90b39eb93.png[/img]MPa[img=17x22]18032b90bb11937.png[/img]，水的压缩系数为4×10[img=17x22]18032b90c32d697.png[/img]MPa[img=17x22]18032b90bb11937.png[/img]，油的压缩系数为10×10[img=17x22]18032b90c32d697.png[/img]MPa[img=17x22]18032b90bb11937.png[/img]，束缚水饱和度为0.3，则油藏容积的压缩系数为 A: 5×10[img=17x22]18032b90e5bd51b.png[/img]MPa[img=17x22]18032b90ee12d55.png[/img] B: 3×10[img=17x22]18032b90e5bd51b.png[/img]MPa[img=17x22]18032b90ee12d55.png[/img] C: 2.2×10[img=17x22]18032b90e5bd51b.png[/img]MPa[img=17x22]18032b90ee12d55.png[/img] D: 3.14×10[img=17x22]18032b90e5bd51b.png[/img]MPa[img=17x22]18032b90ee12d55.png[/img]