※ [本文轉錄自 Math 看板] 作者: lovepigan (在乎就是愛) 看板: Math 標題: [機統] MINITAB統計問題 時間: Fri Oct 9 15:18:42 2009 Regression Analysis: GPA versus ACT The regression equation is GPA = 2.11 + 0.0388 ACT Predictor Coef SE Coef T P Constant 2.1140 0.3209 6.59 0.000 ACT 0.03883 0.01277 3.04 0.003 S = 0.623125 R-Sq = 7.3% R-Sq(adj) = 6.5% 以上是MINITAB的資料分析 然後以下是我遇到的問題 這個搞不太懂是要甚麼 我猜是99%的信賴區間求接受或拒絕虛無假設 所以我用T值求解 2. Obtain a 99 percent confidence interval for the slope and interpret your results. Would you accept or reject the null hypothesis that Beta One = 0 based uponthe confidence interval? ANS: Since the data are all positive. we use two tails to check the data. Suppose that H0: B1=0, Ha: B1 not equal to 0. alpha=0.01(99%=0.99=1-alpha) (H0 means that there has no connection between two data which is null hypothesis, Ha means there has connection which is alternative hypothesis .) If P >=+alpha(T value) or P<= -alpha(T value), than reject H0. If -alpha<P<+alpha, than accept H0. Also we know "t118, 0.005"(alpha's t value) Now, use form to check aplha's t value , we get "t118, 0.005" equal or likely to"2.617"And we can get the T value of data which is "3.04" Since 2.617<3.04(alpha) , we can get the answer that H0 was accepted by the aplha's t value. so H0 was accepted. 所以以上虛無假設是被接受了 但是下面這題我用P值求解 結果竟然是拒絕 3. Test whether or not a linear association exists between GPA and ACT score using alpha = .01. ANS: *Using P(in the session) to check the relationship between GPA and ACT.* P = 0.003 which is less than alpha = 0.01 Therefore, reject the null hypothesis(H0) which suggests that there have no linear relationship between GPA and ACT So, the result is that ACT has linear relationship with GPA. 我剛剛有問老師 老師的提示是說 我寫錯了 所以我懷疑是第二個問題T值求的不是題目要的 請各位大大幫忙吧!!跪* -- http://www.facebook.com/reqs.php#/profile.php?id=729338320&ref=profile http://friends.yam.com/personal/personal.aspx?mid=J8YGf2z6ejk 愛情是屬於一種叫"沉沒"的成本 在決定戀愛的那一刻起 已是無法回頭 所以接下來的每一段 都是你的BENEFIT 不管如何你都是賺到的 --

※ 發信站: 批踢踢實業坊(ptt.cc) ◆ From: 147.4.12.123 -- http://www.facebook.com/reqs.php#/profile.php?id=729338320&ref=profile http://friends.yam.com/personal/personal.aspx?mid=J8YGf2z6ejk 愛情是屬於一種叫"沉沒"的成本 在決定戀愛的那一刻起 已是無法回頭 所以接下來的每一段 都是你的BENEFIT 不管如何你都是賺到的 --

※ 發信站: 批踢踢實業坊(ptt.cc) ◆ From: 147.4.12.123