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KӃ WWK~FJLDLÿR ҥ QWKuQJѭ ӡi tұ p lұ p tӭc duӛ LFKkQSK ҧ i tӯVDXUDWUѭ ӟFYj tӯphҧ LTXDWUiLWKHR SKѭѫQJFKX\ Ӈ Qÿ ӝng ngang, song song vӟi mһ Wÿ ҩ t, duӛi thҷ ng cәFKkQYjPNJLEjQFKkQP ӝ WFiFKQKDQKFKyQJYjG ӭWNKRiW+DLWD\ ү n thӵc hiӋ n che chҳ QEuQKWKѭ ӡng &K~ê 4Xi WUuQKGX ӛ LFKkQYjWL Ӄ S[~FP өFWLrXÿѭ ӧc thӵc hiӋ Qÿ ӗng thӡi YjOLrQW ө c, TXiWUuQKQj\WX\ Ӌ Wÿ ӕ LNK{QJÿѭ ӧc hҥgӕi - cҷ QJFKkQSK ҧ LFRViW YjR ÿL KL ӧc gӗQJ ÿiӡ QJѭ NK{QJ i sӁhҥ n chӃtӕ ÿѭ F ӝÿ ÿzQ ÿiQK Ӄ t 6DX WK~FÿzQÿiQKEjQFKkQSK ҧ i phҧ LYѭ ӧt qua mһ t phҷ QJWѭ ӣQJWѭ ӧng nӕi giӳDQJѭ ӡi ÿiQKYjÿ ӕ i thӫtӯ20-30cm GiaLÿR ̩n 4: V͉W˱WK ͇chu̱n b͓ÿ͋th͹c hi͏ QFiFÿ ͡QJWiFWL ͇ p theo: - Sau kӃ WWK~FÿzQÿiQKWKuO ұ p tӭFWKXFKkQSK ҧ i vӅVDXFKkQWUi WKjQKWѭWK ӃthӫFăQE ҧ Qÿ Ӈchuҭ n bӏthӵc hiӋ QFiFÿ ӝ QJWiFWL Ӄ p theo &K~ê Thӡi JLDQÿ Ӈthӵc hiӋ QJLDQÿR ҥ n Qj\FjQJQJ ҳ QFjQJW ӕt, tay tӯ WѭWK Ӄche thӫvӅWѭWK ӃthӫÿӇsҹ QVjQJWK ӵc hiӋ QFiFÿ ӝ QJWiFWL Ӄ p theo YjNKLWK ӵc hiӋ n vӅWѭWK Ӄchuҭ n bӏWKuSK ҧ Lÿ һ WQKDQKFKkQÿi[X ӕQJÿ ҩ WYjKuQKWKjQ Ӄ thӫnhanh +uQKWK ӭc kiӇ PWUDĈiW ҥt mөFWLrXF ӕÿӏ nh &iFKNL ͋ m tra: WtQKV ӕlҫ QJLk\ 3K˱˯QJSKiSWL ͇ QKjQK KiӇ m tra viӋ c thӵc hiӋ n kӻthuұ t cӫDQJѭ ӡi thӵc hiӋ QYjTX\ÿ ӏ QKFKRQJѭ ӡi giӳlam chҳ n, bҩ m giӡYjQJѭ ӡLÿ Ӄ m sӕÿӇWtQKV ӕlҫ n hiӋ u quҧcӫDQJѭ ӡi thӵc hiӋ n 1Jѭ ӡi thӵc hiӋ n: ÿ ӭng ӣWѭWK ӃthӫFăQE ҧ n thӵc hiӋ QÿzQÿi7 ҥ WYjR lam chҳ QFK~êWK ӵc hiӋ QÿiYjRWkPODPFK ҳ QWKuÿѭ ӧFWtQKO ҫ QÿiWUrQ һ c Gѭ ӟi lam chҳ n sӁNK{QJÿѭ ӧFWtQK , tӵlӵa chӑn khoҧ QJFiFKÿ Ӈthӵc hiӋ QÿzQÿi )  1Jѭ ӡi giӳlam chҳ n cӕÿӏ nh tҥ i chӛNK{QJ ӧc di ÿѭ chuyӇ n theo QJѭ ӡLÿiJL ӳlam chҳ n cӕÿ ӏ nh ӣkhoҧ ng cao tҫ m cәcӫ DQJѭ ӡi thӵc hiӋ n 32 + Dͭ ng cͭ , phͭWi ÿӗng hӗbҩ PJLk\V әJKLFKpSFzLFK ҳ n 1Jѭ ӡi bҩ Pÿ ӗng hӗ%iRWK ӡi gian bҳ Wÿ ҫ XYjWK ӡi gian kӃ WWK~Fÿ Ӈ QJѭ ӡi thӵc hiӋ QYjQJѭ ӡLÿ Ӄ m sӕlҫ n dӯng lҥ i 1Jѭ ӡLÿ Ӄ m sӕ4XDQViWQJѭ ӡi thӵc hiӋ Qÿ ӇÿӃ m sӕlҫ n ( nӃ XQJѭ ӡi thӵc hiӋ n thӵc hiӋ Qÿ~QJYjRWkPWKuÿѭ ӧFWtQKWUrQKR һ FGѭ ӟLWKuNK{QJWt ) * ChӍWLrXÿiQKJLi : 6DX TXi Ӈ m WUuQK tra chung 60 P{Q NL VLQK cӫD FiF ӑ F NKyD NKiF vӅ K QKDX thӵc hiӋ n kӻthuұ W ÿi ҥ t, dӵD YjR WKjQK ӫD FiF ӕL WtFK ӧng Wѭ ÿthӵc hiӋ FQӧ ÿѭ c 7UrQF ӣsӣÿy FK~QJW{LV ӱdө QJF{QJWK ӭFWtQKWKDQJÿL Ӈ mCÿ ӇWtQKÿL Ӈ PYjÿѭD UDFiFFK ӍWLrXÿiQKJLi ChӍWLrXF өthӇ : Bҧng 3.1 Bҧng chӍWLrXÿiQKJLiYjÿL Ӈ m sӕWѭѫQJ ӭng: ĈL Ӄ m sӕ 10 Sӕlҫ Qÿi 16 18 20 22 23 25 27 29 31 32 X X Ĉҥt giӓ i ChӍ Ĉҥ WNKi WLrX YӃ u X X X X X X X X ĈiQKJLiÿ ӝtin cұy cӫa test ĈӇÿiQKJLiÿ ӝtin cұ y cӫa test kiӇ m tra kӻthuұ Wÿi7 ҥ t ӣmөFWLrXF ӕÿ ӏ nh, FK~QJW{LO ҩ y ngү XQKLrQP{QVLQKW ҥ LFQJP ӝt thӡLJLDQÿ ӏ DÿL Ӈ m giӕng FK~QJW{LFKRWK ӵc hiӋ Q7HVWÿi7 ҥ t mөFWLrXF ӕÿӏ nh KӃ t quҧkiӇ PWUDÿ ӝtin cұ y cӫDWHVWÿi7 ҥ t mөFWLrXF ӕÿӏ QKÿѭ ӧFWUuQKEj ӣ bҧ ng 3.2 33 Bҧ ng 3.2 KӃ t quҧkiӇ PWUDÿ ӝtin cұ y cӫa test (n =20) Lҫ n1 HӑYjWrQ (x1) Lҫ n2 (x2) x21 x22 ෍ š‰ƒ‰ ሺ ෍ š‰ƒ‰ ሻ ʹ NguyӉ n ViӋ t Anh 16 14 256 196 30 900 NguyӉ n Huy 'kQ 18 19 324 361 37 1369 Trҩ n ThӃ'NJQJ 17 17 289 289 34 1156 +RjQJ4X ӕ c Hҧ i 20 20 400 400 40 1600 /r+ ҧ i Hұ u 16 17 256 289 33 1089 Trҫ Q%i +QJ 19 19 361 361 38 1444 NguyӉ Q9ăQ +ѭQJ 17 18 289 324 35 1225 Lr9ăQ /jQK 20 21 400 441 41 1681 Ĉһ QJ&{QJ Minh 21 19 441 361 40 1600 10 /r+ ҧ i Nam 14 14 196 196 28 784 11 Trҫ Q+RjQJ Nam 13 13 169 169 26 676 12 NguyӉ Q9ăQ 1KkQ 13 14 169 196 27 729 13 9}9ăQ Phi 19 20 361 400 39 1521 14 %L6 ӻ3K~ 15 16 225 256 31 961 15 /r%i QuyӅ n 15 16 225 256 31 961 16 NguyӉ n Khҳ c Sӱu 18 17 324 289 35 1225 17 HuǤ QK%i Thҧ o 17 18 289 324 35 1225 18 NguyӉ n Ngӑc TiӃ n 17 17 289 289 34 1156 19 Trҫ Q;XkQ Tuҩ n 18 15 324 225 33 1089 20 %L;XkQ ViӋ t 17 17 289 289 34 1156 340 341 5876 5911 691 23547 ෍ ‫ܿ݋݀ݔ‬ ሺ ሻ ʹ 115600 116281 ଶ ෍ ෍ ‫ݔ‬௜ 11787 ‫ݔ‬ ത ത ത ത ത ଵ ǡ ଶ 17 17.05 ෍ ‫ܿ݋݀ݔ‬ ෍ ሺ෍ ‫ܿ݋݀ݔ‬ ሻ ʹ 231881 34 7tQKJLi trӏbiӃ QWKLrQFKXQJ4 c ෍ ෍ ܳ௖ൌ ଶ ଶ ሺ ሻ σσ‫݃݊ܽ݃݊ݔ‬ ͸ͺͳ ൌͳͳ͹ͺ͹ െ ൌͳͻʹ ǡ ͻ͹ͷ ݊݇ ʹͲ ൈʹ ଶ ‫ݔ‬௜ െ 7tQKJLiWU ӏbiӃ QWKLrQJL ӳDFiFQKyP4 G ଶ ଶ ଶ ሻ ሺ ሻ σሺ σ‫ܿ݋݀ݔ‬ σσ‫݃݊ܽ݃݊ݔ‬ ʹ͵ͳͺͺͳ ͸ͺͳ ܳீ ൌ  െ ൌ െ ൌͲǡ Ͳʹͷ ݊ ݊݇ ʹͲ ʹͲ ൈʹ 7tQKJLiWU ӏbiӃ QWKLrQWURQJFiFQKyP4 T ଶ ଶ ଶ ሻ ሺ ሻ σሺ σ‫݃݊ܽ݃݊ݔ‬ σσ‫݃݊ܽ݃݊ݔ‬ ʹ͵ͷͶ͹͸ͺͳ ்ܳ ൌ െ ൌ െ ൌͳ͹ͻ ǡ Ͷ͹ͷ ݇ ݊݇ ʹ ʹͲ ൈʹ *LiWU ӏbiӃ QWKLrQGѭWK ӯa: QD ܳ஽ ൌ ܳ஼െܳீ െ்ܳ ൌͳͻʹ ǡ ͻ͹ͷ െͲǡ Ͳʹͷ െͳ͹ͻ ǡ Ͷ͹ͷ ൌ ͳ͵ ǡ Ͷ͹ͷ 7t QKSKѭѫQJVDLWURQJFiFQKyP ଶ ߜ் ൌ ்ܳ ͳ͹ͻ ǡ Ͷ͹ͷ ൌ ൌͻǡ ͶͶ͸ ݊െͳ ʹͲ െͳ 7tQKSKѭѫQJVDLF ӫa biӃ QWKLrQJL ӳDFiFQKyPYjEL Ӄ QWKLrQGѭWK ӯa: ଶ ߜு ൌ ܳீ ൅ܳ஽ Ͳǡ Ͳʹͷ ൅ͳ͵ ǡ Ͷ͹ͷ ൌ ൌͲǡ ͸͹ͷ ሺ ݇െͳሻ൅ሺ ݊െͳሻ ሺ ݇െͳሻ ͳ൅ͳͻ 7tQKK ӋsӕErQWURQJFiFQKyPWKHRF{ ng thӭc: rtt ଶ ଶ ߜ் െߜு ͻǡ ͶͶ͸ െͲǡ ͸͹ͷ ‫ݎ‬ ൌ ൌ ൌͲǡ ͻ͵ ௧௧ ଶ ͻǡ ͶͶ͸ ߜ் KӃ t quҧhӋsӕWѭѫQJTXDQErQWURQJOj QKѭY ұ y test kiӇ PWUDFyÿ ӝtin cұ y tӕt + Test kiӇ m tra thӇlӵc &K~QJW{LVӱGөQJFiFWHVWQKҵPNLӇPWU DP{QVLQK WұSOX\ӋQWK{QJTXDPӝWVӕWHVWÿѭӧFWU Li 35 [ӃS ORҥL WKӇ - 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