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šÎ µªœ¥µŠ¡µ¦µ ¤¸„µ¦‹oµŠš´Ê ŠÂ¦ŠŠµœÅš¥Â¨³Â¦ŠŠµœ˜nµŠ—o µª ‹¹ŠÁž}œš¸Éœn µœÄ‹«¹ „¬µ‡»–¨´ „¬–³ °ŠÂ¦ŠŠµœš¸É
Á‹o µ °Šªœ¥µŠ¡µ¦µ˜o °Š„µ¦ Áž¦¸¥Áš¸ ¥‡ªµ¤‡·—Á®Èœ °ŠÁ‹oµ °Šªœ¥µŠ¡µ¦µÁ„¸É¥ª„´‡»–¨´ „¬–³ °ŠÂ¦ŠŠµœ
Ś¥Â¨³Â¦ŠŠµœ˜nµŠ—o µª ž{ ‹‹´¥š¸É¤¸‡ªµ¤´ ¤¡´ œ›r˜n°„µ¦‹oµŠŠµœÂ¦ŠŠµœÅš¥Â¨³Â¦ŠŠµœ˜n µŠ—oµª °ŠÁ‹oµ °Šªœ
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¥µŠ¡µ¦µš¸É ¤¸„µ¦‹oµŠÂ¦ŠŠµœ ĜÁ ˜¡ºÊ œš¸É˜Îµ¨Î µœ´„˜oª °ÎµÁ£°³Á—µ ‹´ Š®ª´—Š ¨µ ĜnªŠÁ—º°œ¤·™»œµ¥œ ™¹Š
Á—º °œ˜»¨µ‡¤ 2552 ץčo ª·›¸ »n ¤˜´ª°¥nµŠÂ´Êœ£¼ ¤·(Stratified Sampling) „µ¦»n¤ÄœÂ˜n¨³¦³—´´Êœ°µ«´¥´—nªœ
(Proportional Stratified Random Sampling) ¨³„µ¦»n ¤ÂÁž}œ¦³(Systematic Random Sampling) ™· ˜·š¸É čo
‡º° ‡nµ t-test ‡nµÅ‡ – ‡ª¦r (Chi – Square Test Statistics) ¨³ ´¤ž¦³· š›·Í„µ¦–r‹¦ °Š‡¦³Â¤¦r (Cramer’s
Contingency Coefficient)
Ÿ¨„µ¦ª·‹´¥Â¨³„µ¦°£·ž¦µ¥Ÿ¨
Á‹o µ °Šªœ¥µŠ¡µ¦µ 100 ‡œ š¸ÉÁž}œ„¨»n¤˜´ª°¥nµŠ ¤¸ „µ¦‹oµŠÂ¦ŠŠµœ 3  ‡º° ‹oµŠÂ¦ŠŠµœÅš¥ ¦o °¥¨³ 52
‹oµŠÂ¦ŠŠµœÅš¥„´Â¦ŠŠµœ˜nµŠ—oµª ¦o°¥¨³ 25 š¸ÉÁ®¨º°‹oµŠÂ¦ŠŠµœ˜nµŠ—oµª ¨³¤¸ ªœ¥µŠ¡µ¦µ‹Î µœªœ 180 ž¨Š
‹oµŠÂ¦ŠŠµœÅš¥ ¦o °¥¨³ 66 š¸ÉÁ®¨º°‹oµŠÂ¦ŠŠµœ˜nµŠ—oµª Ž¹ÉŠn ªœÄ®nÁž}œ´µ˜·¡¤n µ Á‹oµ °Šªœ¥µŠ¡µ¦µn ªœ
Ä®n ¤¸°µ¥» 41-50 že „µ¦«¹„¬µ¦³—´¤´ ›¥¤«¹„¬µ˜°œ˜oœ ‡¦´ªÁ¦º °œ¤¸¦µ¥Å—o ‹µ„ªœ¥µŠ¡µ¦µÁŒ¨¸É¥˜n°že 100,001 –
200,000 µš ¤¸ ¡ºÊ œš¸É ªœ¥µŠ¡µ¦µ 21-40 Ŧn Áž}œ¡ºÊœš¸É¦µ ®n µŠ‹µ„®¤¼noµœ 1- 2 „·Ã¨Á¤˜¦ ‹Îµ®œnµ¥Ÿ¨Ÿ¨· ˜Äœ¦¼ž
œÊε¥µŠ— ‹n µ¥‡nµ‹oµŠÄœ´—nªœ¨¼ „‹oµŠ 40: œµ¥‹o µŠ 60 ¨³‹nµ¥Áž}œ¦µ¥´ ž—µ®r Á„–”r„µ¦„Î µ®œ—‡nµ‹oµŠ ¹Êœ°¥¼n „´
¨´„¬–³¡ºÊœš¸É ªœ¥µŠ¡µ¦µ Ĝ¦° 3 žeš¸É Ÿnµœ¤µÅ¤n¤¸„µ¦Áž¨¸É¥œ¨¼„‹oµŠ
Ÿ¨„µ¦«¹„¬µ‡»–¨´ „¬–³ °ŠÂ¦ŠŠµœš¸É Á‹oµ °Šªœ¥µŠ¡µ¦µ˜o °Š„µ¦¤µ„š¸É » — ‡º° ‡ªµ¤ ¥´ œ°—šœ
¦°Š¨Š¤µ ‡º° ‡ªµ¤ŽºÉ°´˜¥r »‹¦·˜ ¦o°¥¨³ 35 ¨³ 26 ˜µ¤¨Îµ—´ —Šªnµ‡»–¨´„¬–³—´Š„¨nµª œnµ‹³nŠŸ¨„¦³š˜n °
¦µ¥Å—o°ŠÁ‹o µ °Šªœ¥µŠ¡µ¦µ ¤µ„„ªnµš´ „¬³Äœ„µ¦„¦¸—¥µŠ °ŠÂ¦ŠŠµœ Ž¹É ŠÁ‹oµ °Šªœ¥µŠ¡µ¦µ˜o°Š„µ¦ Á¡¸¥Š
¦o°¥¨³ 8 °—‡¨o °Š„´Šµœª·‹´¥ °Š¤œ˜¦¸ ³Ãœª¦¦–³ (2545) š¸ÉÁ®ÈœªnµÂ¦ŠŠµœ˜nµŠ—o µªš—šœÂ¦ŠŠµœÅš¥š¸É
µ—‡¨œÅ—o —¸ Á¡¦µ³¤¸‡ªµ¤ ¥´œ°—šœ ŤnÁ„¸É¥ŠŠµœ ¨³Å¤n¤¸ÁŠºÉ°œÅ o°Á¦¸¥„¦o°Š˜nµŠÇ