问题如下图：
选项：
A. 
B. 
C. 
解释：
老师，这道题我做对了，能稍微解释一下卡方分布的定义和性质，还有在什么情况下使用么？谢谢！
NO.PZ201512020300000401问题如下 1. Regarng the intern’s Question 1, is the regression mol a whole significant the 0.05 level?A.No, because the calculateF-statistic is less ththe criticvalue for F.B.Yes, because the calculateF-statistic is greater ththe criticvalue for F.C.Yes, because the calculateχ 2 statistic is greater ththe criticvalue for [#PZMATH172#].B is correct.The F-test is useto termine if the regression mol a whole is significant.F = Mesquare regression (MSR) ÷ Mesquareerror (MSE)MSE = SSE/[n – (k + 1)] = 19,048 ÷ 427 = 44.60MSR = SSR/k = 1071 ÷ 3 = 357F = 357 ÷ 44.60 = 8.004The criticvalue for grees of freem of 3 an427 with α=0.05 (one-tail) is F = 2.63 from Exhibit 5. The calculateF is greater ththe criticvalue, anChiesa shoulrejethe null hypothesis thall regression coefficients are equto zero. 本题中为什么2是427？1和2分别指什么什么数值？
NO.PZ201512020300000401 问题如下 1. Regarng the intern’s Question 1, is the regression mol a whole significant the 0.05 level? A.No, because the calculateF-statistic is less ththe criticvalue for F. B.Yes, because the calculateF-statistic is greater ththe criticvalue for F. C.Yes, because the calculateχ 2 statistic is greater ththe criticvalue for [#PZMATH172#]. B is correct.The F-test is useto termine if the regression mol a whole is significant.F = Mesquare regression (MSR) ÷ Mesquareerror (MSE)MSE = SSE/[n – (k + 1)] = 19,048 ÷ 427 = 44.60MSR = SSR/k = 1071 ÷ 3 = 357F = 357 ÷ 44.60 = 8.004The criticvalue for grees of freem of 3 an427 with α=0.05 (one-tail) is F = 2.63 from Exhibit 5. The calculateF is greater ththe criticvalue, anChiesa shoulrejethe null hypothesis thall regression coefficients are equto zero. 老师 这题是不是可以直接用P-value 来判断，所有X的P-value都小于0.01 那就说明都是significant？ 另外想我问下 α=0.05是因为下面图表上标明了是0.05就直接认为是这题的α是0.05么？
NO.PZ201512020300000401 问题如下 1. Regarng the intern’s Question 1, is the regression mol a whole significant the 0.05 level? A.No, because the calculateF-statistic is less ththe criticvalue for F. B.Yes, because the calculateF-statistic is greater ththe criticvalue for F. C.Yes, because the calculateχ 2 statistic is greater ththe criticvalue for [#PZMATH172#]. B is correct.The F-test is useto termine if the regression mol a whole is significant.F = Mesquare regression (MSR) ÷ Mesquareerror (MSE)MSE = SSE/[n – (k + 1)] = 19,048 ÷ 427 = 44.60MSR = SSR/k = 1071 ÷ 3 = 357F = 357 ÷ 44.60 = 8.004The criticvalue for grees of freem of 3 an427 with α=0.05 (one-tail) is F = 2.63 from Exhibit 5. The calculateF is greater ththe criticvalue, anChiesa shoulrejethe null hypothesis thall regression coefficients are equto zero. 这题里面的x项不是只有两个吗？k为什么等于3？
NO.PZ201512020300000401 问题如下 1. Regarng the intern’s Question 1, is the regression mol a whole significant the 0.05 level? A.No, because the calculateF-statistic is less ththe criticvalue for F. B.Yes, because the calculateF-statistic is greater ththe criticvalue for F. C.Yes, because the calculateχ 2 statistic is greater ththe criticvalue for [#PZMATH172#]. B is correct.The F-test is useto termine if the regression mol a whole is significant.F = Mesquare regression (MSR) ÷ Mesquareerror (MSE)MSE = SSE/[n – (k + 1)] = 19,048 ÷ 427 = 44.60MSR = SSR/k = 1071 ÷ 3 = 357F = 357 ÷ 44.60 = 8.004The criticvalue for grees of freem of 3 an427 with α=0.05 (one-tail) is F = 2.63 from Exhibit 5. The calculateF is greater ththe criticvalue, anChiesa shoulrejethe null hypothesis thall regression coefficients are equto zero. overall regression mol is significant？
老师好，这题我没有疑问，题目和的显示有问题，烦请修正，谢谢
