【正文】 0110110101110000111000111011011011011221110011100011101101101101102311210121010011011110110143424131212rrrrrrrrrr? 3)( ?AR （四）證明題（每小題 4 分，共 12 分） ⒎對任意方陣 A ，試證 A A? ? 是對稱矩陣． 證明： 39。(39。 :? ? ? ?? ?，需 選取統(tǒng)計量 nxU / 0? ??? ． 5．假設(shè)檢驗中的顯著性水平 ? 為 事件 ux ?? || 0? （ u為臨界值） 發(fā)生的概率． （三）解答題 1．設(shè)對總體 X 得到一個容量為 10 的樣本值 , , , , , , , , , 試分別計算樣本均值 x 和樣本方差 s2 ． 解： 101101 10 1 ???? ??i ixx 91)(110 1 210 12 ?????? ??i i xxs 2．設(shè)總體 X 的概率密度函數(shù)為 f x x x( 。t do that it will go on and go on. We have to stop it。s 150th anniversary celebrations and will attend City39。s governing body, has also ordered an immediate investigation into the referee39。s not needed. Instead, he plans to deploy his 270squarefoot (25squaremeter) main chute at an altitude of around 5,000 feet (1,524 meters). In order to deploy this chute successfully, he will have to slow to 172 mph (277 kph). He will have a reserve parachute that will open automatically if he loses consciousness at mach speeds. Even if everything goes as planned, it won39。s plaint. In a statement the Russian side added: We found no racist insults from fans of CSKA. Baumgartner the disappointing news: Mission aborted. The supersonic descent could happen as early as Sunda. The weather plays an important role in this mission. Starting at the ground, conditions have to be very calm winds less than 2 mph, with no precipitation or humidity and limited cloud cover. The balloon, with capsule attached, will move through the lower level of the atmosphere (the troposphere) where our daytoday weather lives. It will climb higher than the tip of Mount Everest ( miles/ kilometers), drifting even higher than the cruising altitude of mercial airliners ( miles/ kilometers) and into the stratosphere. As he crosses the boundary layer (called the tropopause),e can expect a lot of turbulence. The balloon will slowly drift to the edge of space at 120,000 feet ( 專業(yè)好文檔 16 Then, I would assume, he will slowly step out onto something resembling an Olympic diving platform. Below, the Earth bees the concrete bottom of a swimming pool that he wants to land on, but not too hard. Still, he39。s about how he felt and I would like to speak to him first to find out what his experience was. Uefa has opened disciplinary proceedings against CSKA for the racist behaviour of their fans during City39。s celebrations said he wanted to meet Ivory Coast international Toure to discuss his plaint. CSKA general director Roman Babaev says the matter has been exaggerated by the Ivorian and the British media. Blatter, 77, said: It has been decided by the Fifa congress that it is a nonsense for racism to be dealt with with fines. You can always find money from somebody to pay them. It is a nonsense to have matches played without spectators because it is against the spirit of football and against the visiting team. It is all nonsense. We can do something better to fight racism and discrimination. This is one of the villains we have today in our game. But it is only with harsh sanctions that racism and discrimination can be washed out of football. The (lack of) air up there Watch mCayman Islandsbased Webb, the head of Fifa39。,( 21121 nninin xxxxxxxL ?? ? ???? ? 0ln1ln,ln)1ln (ln 11 ??????? ?? ?? ni ini i xnd LdxnL ???? ， 1ln?1??? ??ni ixn? 3．測兩點之間的直線距離 5 次，測得距離的值為（單位： m）： 測量值可以認(rèn)為是服從正態(tài)分布 N( , )? ?2 的，求 ? 與 ?2 的估計值．并在⑴ ?2 25? . ；⑵ ?2 未知的情況下，專業(yè)好文檔 14 分別求 ? 的置信度為 的置信區(qū)間． 解： 11051? 51 ??? ??i ixx? )(15 1? 5122 ????? ??i i xxs? （ 1）當(dāng) ?2 25? . 時，由 1－ α ＝ ， 97 21)( ???? ?? 查表得： ?? 故所求置信區(qū)間為： ] 1 1, 0 8[],[ ???nxnx ???? （ 2）當(dāng) 2? 未知時，用 2s 替代 2? ，查 t (4, ) ，得 ?? 故所求置信區(qū)間為： ],[],[ ???nsxnsx ?? 4．設(shè)某產(chǎn)品的性能指標(biāo)服從正態(tài)分布 N( , )? ?2 ，從歷史資料已知 ??4 ，抽查 10 個樣品，求得均值為 17，取顯著性水平 ??005. ，問原假設(shè) H0 20:?? 是否成立． 解： 3|10/4 2017||/||| 0 ??????? nxU ? ?， 由 97 )( ???? ?? ，查表得： ?? 因為 || ?U ，所以拒絕 0H 5．某零件長度服從正態(tài)分布，過去 的均值為 ，現(xiàn)換了新材料，從產(chǎn)品中隨機(jī)抽取 8 個樣品，測得的長度為（單位： cm）： , , , , , , , 問用新材料做的零件平均長度是否起了變化（ ??005. ）． 解：由已知條件可求得： ?x ?s 13 6 |8/ 2020 2 ||/||| 0 ?????? nsxT ? ),9(),1( ???? tnt? ∵ | T | ∴ 接受 H0 即用新材料做的零件平均長度沒有變化。39。)39。39。)39。 ) ( ) ,? ? ?? ? ? ???? 1 0 10 其它 試分別用矩估計法和最大似然估計法估計參數(shù) ? ． 解：提示教材第 214 頁例 3 矩估計： ,121)1()( 110 ?? ???????? ni ixnxdxxxXE ??? ?xx??? 1 12?? 最大似然 估計： ?? ??? )()1()1()。 we need the courage to do it. His ments came hours after Fifa vicepresident Jeffrey Webb also in London for the FA39。s Premier League match at Chelsea on Sunday. I am going to be at the match tomorrow and I have asked to meet Yaya Toure, he told BBC Sport. For me it39。s actions. CSKA said they were surprised and disappointed by Toure39。t. Baumgartner still will free fall at a speed that would cause you and me to pass out, and no parachute is guaranteed to work higher than 25,000 feet (7,620 meters). cause there