20xx年電大社會(huì)工作與管理本專業(yè)社會(huì)統(tǒng)計(jì)學(xué)試題資料匯總-wenkub
2023-04-07 00:18:28 本頁面
【正文】 D．6．估計(jì)標(biāo)準(zhǔn)誤說明回歸直線的代表性，因此 【 】A．估計(jì)標(biāo)準(zhǔn)誤數(shù)值越大，說明回歸直線的代表性越大；B．估計(jì)標(biāo)準(zhǔn)誤數(shù)值越大，說明回歸直線的代表性越??；C．估計(jì)標(biāo)準(zhǔn)誤數(shù)值越小，說明回歸直線的代表性越??；D．估計(jì)標(biāo)準(zhǔn)誤數(shù)值越小，說明回歸直線的實(shí)用價(jià)值越小。7．平均差與標(biāo)準(zhǔn)差的主要區(qū)別是 【 】A．意義有本質(zhì)的不同 B．適用條件不同C．對(duì)離差的數(shù)學(xué)處理方法不同 D．反映的變異程度不同8．“統(tǒng)計(jì)”一詞的含義可以包括的是 【 】A．統(tǒng)計(jì)工作、統(tǒng)計(jì)資料、統(tǒng)計(jì)學(xué) B．統(tǒng)計(jì)工作、統(tǒng)計(jì)資料、統(tǒng)計(jì)方法C．統(tǒng)計(jì)資料、統(tǒng)計(jì)學(xué)、統(tǒng)計(jì)方法 D．統(tǒng)計(jì)工作、統(tǒng)計(jì)學(xué)、統(tǒng)計(jì)方法9．已知甲數(shù)列的算術(shù)平均數(shù)為100，標(biāo)準(zhǔn)差為20；乙數(shù)列的算術(shù)平均數(shù)為50，標(biāo)準(zhǔn)差為9。4．參數(shù)優(yōu)良估計(jì)的三個(gè)標(biāo)準(zhǔn)是 、有效性、一致性。8．袋中有4個(gè)白球，7個(gè)黑球，從中任意取一個(gè)球．則取出白球的概率為 。四、證明題（每小題6分，共12分）1．證明 若0，0，則有（1） 當(dāng)與獨(dú)立時(shí)，與相容；（2） 當(dāng)與不相容時(shí)，與不獨(dú)立。3．（10分）已知某煉鐵廠鐵水含碳量服從正態(tài)分布，現(xiàn)在測(cè)定了九爐鐵水。2．答：異動(dòng)比率；極差；四分互差；方差與標(biāo)準(zhǔn)差。（2） （3分）（3）當(dāng)x0時(shí),F(x)=0。 in response to activation of this nerve supply, smooth muscle contracts (notably in the gut), the frequency of heart beat is slowed, and glands secrete. Acetylcholine is also an important transmitter at many sites in the brain at nervetonerve synapses. To understand how acetylcholine brings about a variety of effects in different cells it is necessary to understand membrane receptors. In postsynaptic membranes (those of the cells on which the nerve fibres terminate) there are many different sorts of receptors and some are receptors for acetylcholine. These are protein molecules that react specifically with acetylcholine in a reversible fashion. It is the plex of receptor bined with acetylcholine which brings about a biophysical reaction, resulting in the response from the receptive cell. Two major types of acetylcholine receptors exist in the membranes of cells. The type in skeletal muscle is known as ‘nicotinic’。. After the arrival of a nerve signal at the termination of an axon, the vesicles fuse with the cell membrane, causing the release of acetylcholine into theprotein. There are two main types of cholinergic receptors, nicotinic and muscarinic. Nicotinic receptors are located at synapses between two neurons and at synapses between neurons and skeletal muscle cells. Upon activation a nicotinic receptor acts as a channel for the movement of ions into and out of the neuron, directly resulting in also called action painting and the New York school. It was the first important school in American painting to declare its independence from European styles and to influence the development of art abroad. Arshile Gorky first gave impetus to the movement. His paintings, derived at first from the art of Picasso, Mir243。 among other major abstract expressionists were such painters as Clyfford Still, Theodoros Stamos, Adolph
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