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電大社會(huì)統(tǒng)計(jì)學(xué)試卷a及答案解析資料參考-文庫(kù)吧

2025-05-14 15:50 本頁(yè)面


【正文】 P 值進(jìn)行檢驗(yàn)比根據(jù)統(tǒng)計(jì)量檢驗(yàn)提供更多的信息.統(tǒng)計(jì)量檢驗(yàn)是我們事先給出的一個(gè)顯著性水平,以此為標(biāo)準(zhǔn)進(jìn)行決 策,無(wú)法知道實(shí)際的顯著性水平究竟是多少. 四、計(jì)算分析題: 10+ 15=25分 一種以休閑和娛樂(lè)為主題的雜志,聲稱其讀者群中有 80%為女性。為驗(yàn)證這一說(shuō)法是否屬實(shí),某研究部門(mén)抽取了由 100人組成的一個(gè)隨機(jī)樣本,發(fā)現(xiàn)有 46 個(gè)女性經(jīng)常閱讀該雜志。取顯著性水平 ?=,檢驗(yàn)該雜志讀者群中女性的比例是否為 80%? H0 : ? = 80% H1 : ? ? 80% ? = n = 100 檢驗(yàn)統(tǒng)計(jì)量 : 1 0 0)( ??????z 結(jié)論 : 沒(méi)有證據(jù)表明 “該雜志聲稱讀者 群中有 80%為女性 ”的看法正確 有四個(gè)品牌的彩電在五個(gè)地區(qū)銷(xiāo)售,為分析彩電的品牌 (因素 A)和銷(xiāo)售地區(qū) (因素 B)對(duì)銷(xiāo)售量是否有影響,對(duì)每個(gè)品牌在各地區(qū)的銷(xiāo)售量取得以下數(shù)據(jù),見(jiàn)下表。試結(jié)合 Excel 輸出的結(jié)果分析品牌和銷(xiāo)售地區(qū)對(duì)彩電的銷(xiāo)售量是否有顯著影響? 不同品牌的彩電在各地區(qū)的銷(xiāo)售量數(shù)據(jù) 品牌 銷(xiāo)售地區(qū) ( 因素 B ) (因素 A) B1 B2 B3 B4 B5 A1 A2 A3 A4 365 345 358 288 350 368 323 280 343 363 353 298 340 330 343 260 323 333 308 298 Excel輸出的結(jié)果如下: 對(duì)因素 A 提出的假設(shè)為 H0: m1=m2=m3=m4 (品牌對(duì)銷(xiāo)售量沒(méi)有影響 ) H1: mi (i =1,2, … , 4) 不全相等 (品牌對(duì)銷(xiāo)售量有影響 ) 對(duì)因素 B 提出的假設(shè)為 H0: m1=m2=m3=m4=m5 (地區(qū)對(duì)銷(xiāo)售量沒(méi)有影響 ) H1: mj (j =1,2,…,5) 不全相等 (地區(qū)對(duì)銷(xiāo)售量有影響 ) 結(jié)論: FA= F?= ,拒絕原假設(shè) H0,說(shuō)明彩電的品牌對(duì)銷(xiāo)售量有顯著影響 FB= F?= ,接受原假設(shè) H0,說(shuō)明銷(xiāo)售地區(qū)對(duì)彩電的銷(xiāo)售量沒(méi)有顯著影響 已知: ? = 時(shí), Zα /2= ?= 時(shí), Zα /2= ?= 時(shí), Zα /2= 差異源 SS df MS F P v a l u e F c r i t 行 ( 因素 A ) 1 3 0 0 4 .5 5 3 4 3 3 4 .8 5 1 8 .1 0 7 7 7 9 .4 6 E 0 5 3 .4 9 0 3 列 ( 因素 B ) 2 0 1 1 .7 4 5 0 2 .9 2 5 2 .1 0 0 8 4 6 0 .1 4 3 6 6 5 3 .2 5 9 2 誤差 2 8 7 2 .7 12 2 3 9 .3 9 1 7 總和 1 7 8 8 8 .9 5 19請(qǐng)您刪除一下內(nèi)容, O(∩ _∩ )O 謝謝!?。?2021 年中央電大期末復(fù) 習(xí)考試小抄大全,電大期末考試必備小抄,電大考試必過(guò)小抄Acetylcholine is a neurotransmitter released from nerve endings (terminals) in both the peripheral and the central nervous systems. It is synthesized within the nerve terminal from choline, taken up from the tissue fluid into the nerve ending by a specialized transport mechanism. The enzyme necessary for this synthesis is formed in the nerve cell body and passes down the axon to its end, carried in the axoplasmic flow, the slow movement of intracellular substance (cytoplasm). Acetylcholine is stored in the nerve terminal, sequestered in small vesicles awaiting release. When a nerve action potential reaches and invades the nerve terminal, a shower of acetylcholine vesicles is released into the junction (synapse) between the nerve terminal and the ‘effector’ cell which the nerve activates. This may be another nerve cell or a muscle or gland cell. Thus electrical signals are converted to chemical signals, allowing messages to be passed between nerve cells or between nerve cells and nonnerve cells. This process is termed ‘chemical neurotransmission’ and was first demonstrated, for nerves to th
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