Question

ij´óѧµÄÒ»¸öÉç»áʵ¼ùµ÷²éС×é,ÔÚ¶Ô´óѧÉúµÄÁ¼ºÃ¡°¹âÅÌÏ°¹ß¡±µÄµ÷査ÖÐ,Ëæ»ú·¢·ÅÁËl20·ÝÎÊ巻¡£¶ÔÊջصÄl00·ÝÓÐЧÎʾí½øÐÐͳ¼Æ£¬µÃµ½ÈçÏÂ2 x2ÁÐÁª±í:

	×ö²»µ½¹âÅÌ	ÄÜ×öµ½¹âÅÌ	ºÏ¼Æ
ÄÐ	45	10	55
Å®	30	15	45
ºÏ¼Æ	75	25	100

£¨1£©ÏÖÒÑ°´ÊÇ·ñÄÜ×öµ½¹âÅÌ·Ö²ã´Ó45·ÝÅ®ÉúÎʾíÖгéÈ¡ÁË9·ÝÎÊ¾í£¬Èô´ÓÕâ9·ÝÎʾíÖÐËæ»ú³éÈ¡4·Ý£¬²¢¼ÇÆäÖÐÄÜ×öµ½¹âÅ̵ÄÎʾíµÄ·ÝÊýΪ£¬ÊÔÇóËæ»ú±äÁ¿µÄ·Ö²¼ÁкÍÊýѧÆÚÍû

£¨2£©Èç¹ûÈÏΪÁ¼ºÃ¡°¹âÅÌÏ°¹ß¡±ÓëÐÔ±ðÓйط¸´íÎóµÄ¸ÅÂʲ»³¬¹ýP£¬ÄÇô¸ù¾ÝÁÙ½çÖµ±í×ȷµÄPµÄֵӦΪ¶àÉÙ£¿Çë˵Ã÷ÀíÓÉ¡£

¸½£º¶ÀÁ¢ÐÔ¼ìÑéͳ¼ÆÁ¿K2=, ÆäÖУ¬

¶ÀÁ¢ÐÔ¼ìÑéÁÙ½ç±í£º

P(K2k0)	0.25	0.15	0.10	0.05	0.025
k0	1.323	2.072	2.706	3.840	5.024

Answer 1

½â£º£¨1£©ÒòΪ9·ÝÅ®ÉúÎʾíÊÇÓ÷ֲã³éÑù·½·¨È¡µÃµÄ£¬ËùÒÔ9·ÝÎʾíÖÐÓÐ6·Ý×ö²»µ½¹âÅÌ£¬3·ÝÄÜ×öµ½¹âÅÌ¡£¡­¡­¡­¡­¡­¡­¡­¡­2·Ö

 

¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­6·Ö

ËùÒÔ¡­¡­¡­¡­¡­¡­¡­¡­8·Ö

£¨2£©¡­¡­¡­¡­10·Ö

ÒòΪ,ËùÒÔÄÜÔÚ·¸´íÎóµÄ¸ÅÂʲ»³¬¹ý0.10µÄÇ°ÌáÏÂÈÏΪÁ¼ºÃ¡°¹âÅÌÏ°¹ß¡±ÓëÐÔ±ðÓйأ¬¼´¾«È·µÄֵӦΪ¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­12·Ö