Question

14£®Îª´óÁ¦Ìᳫ¡°À÷Ðнڼ󣬷´¶ÔÀË·Ñ¡±£¬Ä³¸ßÖÐͨ¹ýËæ»úѯÎÊ100ÃûÐÔ±ð²»Í¬µÄѧÉúÊÇ·ñ×öµ½¡°¹âÅÌ¡±Ðж¯£¬µÃµ½Èç±íËùʾÁª±í¼°¸½±í£º

	×ö²»µ½¡°¹âÅÌ¡±Ðж¯	×öµ½¡°¹âÅÌ¡±Ðж¯
ÄÐ	45	10
Å®	30	15

P£¨K2¡Ýk0£©	0.10	0.05	0.025
k0	2.706	3.841	5.024

¾­¼ÆË㣺K²=$\frac{n£¨ad-bc£©^{2}}{£¨a+b£©£¨c+d£©£¨a+c£©£¨b+d£©}$¡Ö3.03£¬²Î¿¼¸½±í£¬µÃµ½µÄÕýÈ·½áÂÛÊÇ£¨¡¡¡¡£©

• A£® ÓÐ95%µÄ°ÑÎÕÈÏΪ¡°¸ÃѧÉúÄÜ·ñ×öµ½¹âÅÌÐе½ÓëÐÔ±ðÓйء±
• B£® ÓÐ95%µÄ°ÑÎÕÈÏΪ¡°¸ÃѧÉúÄÜ·ñ×öµ½¹âÅÌÐе½ÓëÐÔ±ðÎ޹ء±
• C£® ÓÐ90%µÄ°ÑÎÕÈÏΪ¡°¸ÃѧÉúÄÜ·ñ×öµ½¹âÅÌÐе½ÓëÐÔ±ðÓйء±
• D£® ÓÐ90%µÄ°ÑÎÕÈÏΪ¡°¸ÃѧÉúÄÜ·ñ×öµ½¹âÅÌÐе½ÓëÐÔ±ðÎ޹ء±

Answer 1

·ÖÎö ͨ¹ý¹Û²âÖµ²ÎÕÕÁÙ½çÖµ±í¼´¿ÉµÃµ½ÕýÈ·½áÂÛ£®

½â´ð ½â£ºÓÉK²=$\frac{n£¨ad-bc£©^{2}}{£¨a+b£©£¨c+d£©£¨a+c£©£¨b+d£©}$¡Ö3.03£¬²Î¿¼¸½±í£¬
¡ß2.706£¼3.030£¼3.841£®
¡àÓÐ90%µÄ°ÑÎÕÈÏΪ¡°¸ÃѧÉúÄÜ·ñ×öµ½¹âÅÌÐж¯µ½ÓëÐÔ±ðÓйء±£®

µãÆÀ ±¾Ì⿼²éÁ˶ÀÁ¢ÐÔ¼ìÑéµÄÓ¦Ó㬸ø³öÁ˹۲âÖµ£¬Ö»Òª½øÐбȽϾͿÉÒÔ£¬´ËÌâÊÇ»ù´¡Ì⣮