问题如下图：
选项：
A. 
B. 
C. 
解释：
这个解释与老师讲的方法好像不太一样呢？在算test statistic的时候不是应该用均减去300再除以标准误吗? 此题的解题思路是怎样的？谢谢！
NO.PZ2015120604000144 问题如下 Quintina concts a hypothesis to test whether the varianof the annually return is 0.0144. Then she selects ranm 25 year's ta a sample, Quintina figures out the varianof the sample is 0.013924. Assume the level of significanis 5%, whiof the following conclusion is least accurate? A.The population varianis not significant fferent from 0.0144. B.The population varianis significantly fferent from 0.0144. C.This hypothesis is appropriate to use the chi-square test. B is correct. The null hypothesis is H0: σ2=0.0144. It is appropriate to use the two-tailechi-square test.The test statistic is:=(25-1)*0.013924/0.0144=23.21The criticchi-square criticvalues are 12.4 an39.36.Because the test statistic falls between these two values,so Quintina fails to rejethe null hypothesis. So we conclu ththe population varianis not significantly fferent from 0.0144.题干是问whiis the least accurate?所以选 考试中会有需要记忆分布表的情况吗？
NO.PZ2015120604000144问题如下 Quintina concts a hypothesis to test whether the varianof the annually return is 0.0144. Then she selects ranm 25 year's ta a sample, Quintina figures out the varianof the sample is 0.013924. Assume the level of significanis 5%, whiof the following conclusion is least accurate? A.The population varianis not significant fferent from 0.0144.B.The population varianis significantly fferent from 0.0144.C.This hypothesis is appropriate to use the chi-square test. B is correct. The null hypothesis is H0: σ2=0.0144. It is appropriate to use the two-tailechi-square test.The test statistic is:=(25-1)*0.013924/0.0144=23.21The criticchi-square criticvalues are 12.4 an39.36.Because the test statistic falls between these two values,so Quintina fails to rejethe null hypothesis. So we conclu ththe population varianis not significantly fferent from 0.0144.题干是问whiis the least accurate?所以选rt 题干信息量略多，哪些关键词能看出来是卡方的考点
NO.PZ2015120604000144 问题如下 Quintina concts a hypothesis to test whether the varianof the annually return is 0.0144. Then she selects ranm 25 year's ta a sample, Quintina figures out the varianof the sample is 0.013924. Assume the level of significanis 5%, whiof the following conclusion is least accurate? A.The population varianis not significant fferent from 0.0144. B.The population varianis significantly fferent from 0.0144. C.This hypothesis is appropriate to use the chi-square test. B is correct. The null hypothesis is H0: σ2=0.0144. It is appropriate to use the two-tailechi-square test.The test statistic is:=(25-1)*0.013924/0.0144=23.21The criticchi-square criticvalues are 12.4 an39.36.Because the test statistic falls between these two values,so Quintina fails to rejethe null hypothesis. So we conclu ththe population varianis not significantly fferent from 0.0144.题干是问whiis the least accurate?所以选 如果在考试过程中也有类似的题，他会提供卡方的表吗？还是我们得自己记
NO.PZ2015120604000144 问题如下 Quintina concts a hypothesis to test whether the varianof the annually return is 0.0144. Then she selects ranm 25 year's ta a sample, Quintina figures out the varianof the sample is 0.013924. Assume the level of significanis 5%, whiof the following conclusion is least accurate? A.The population varianis not significant fferent from 0.0144. B.The population varianis significantly fferent from 0.0144. C.This hypothesis is appropriate to use the chi-square test. B is correct. The null hypothesis is H0: σ2=0.0144. It is appropriate to use the two-tailechi-square test.The test statistic is:=(25-1)*0.013924/0.0144=23.21The criticchi-square criticvalues are 12.4 an39.36.Because the test statistic falls between these two values,so Quintina fails to rejethe null hypothesis. So we conclu ththe population varianis not significantly fferent from 0.0144.题干是问whiis the least accurate?所以选 criticvalue 根据公式不应该是 24*23.21 吗？。criticvalue 地两个值如何算出来的？
NO.PZ2015120604000144问题如下 Quintina concts a hypothesis to test whether the varianof the annually return is 0.0144. Then she selects ranm 25 year's ta a sample, Quintina figures out the varianof the sample is 0.013924. Assume the level of significanis 5%, whiof the following conclusion is least accurate? A.The population varianis not significant fferent from 0.0144.B.The population varianis significantly fferent from 0.0144.C.This hypothesis is appropriate to use the chi-square test. B is correct. The null hypothesis is H0: σ2=0.0144. It is appropriate to use the two-tailechi-square test.The test statistic is:=(25-1)*0.013924/0.0144=23.21The criticchi-square criticvalues are 12.4 an39.36.Because the test statistic falls between these two values,so Quintina fails to rejethe null hypothesis. So we conclu ththe population varianis not significantly fferent from 0.0144.题干是问whiis the least accurate?所以选老师。。答案全出来了。。。用哪个值跟12.401和39比啊
