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2023-03-13 19:39Module 7-Practice Problems-Question 29-(1)比如這題的A,B選項(xiàng),問的是whether is less than or equal to 某個(gè)值,那么原假設(shè)應(yīng)該怎么設(shè)?我的理解是:A選項(xiàng),原假設(shè) slope>0.15, 備擇假設(shè)slope<=0.15, 計(jì)算得出的t=1.1237小于critical value2.441, 即無(wú)法拒絕原假設(shè),所以是備擇假設(shè)slope <=0.15, 那么A應(yīng)該是對(duì)的?(2)B選項(xiàng),檢驗(yàn)的是intercept的coefficient? coefficient即slope?參照書(2022-L1V1)P458 Exhibit 26而不是Exhibit 27? 書(2022-L1V1)上公式17-Hypothesis tests of the intercept與公式15-Hypothesis tests of the slope coefficient之間的用法區(qū)別是?
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1個(gè)回答
Evian, CFA助教
2023-03-14 18:22
該回答已被題主采納
ヾ(?°?°?)??你好同學(xué),
Module 7-Practice Problems-Question 29
(1)比如這題的A,B選項(xiàng),問的是whether is less than or equal to 某個(gè)值,那么原假設(shè)應(yīng)該怎么設(shè)?
【回復(fù)】將“l(fā)ess than or equal to 某個(gè)值”設(shè)為備擇假設(shè),然后推出原假設(shè)
我的理解是:A選項(xiàng),原假設(shè) slope>0.15, 備擇假設(shè)slope<=0.15, 計(jì)算得出的t=1.1237小于critical value2.441, 即無(wú)法拒絕原假設(shè),所以是備擇假設(shè)slope <=0.15, 那么A應(yīng)該是對(duì)的?
【回復(fù)】理解沒有問題,不過29題題目要選“should reject”,同學(xué)你分析的“無(wú)法拒絕原假設(shè)”說明A不選
(2)B選項(xiàng),檢驗(yàn)的是intercept的coefficient?
【回復(fù)】是的,截距是0.0095
coefficient即slope?
【回復(fù)】coefficient中文是“系數(shù)”的意思,在題目中表示某個(gè)項(xiàng)目的數(shù)字
參照書(2022-L1V1)P458 Exhibit 26而不是Exhibit 27?
【回復(fù)】參考的是“Exhibit 27 Test of Hypothesis for Intercept for Regression of ROA on CAPEX”,因?yàn)樗顷P(guān)于“截距”的假設(shè)檢驗(yàn),而不是Exhibit 26的slope斜率的檢驗(yàn)。
書(2022-L1V1)上公式17-Hypothesis tests of the intercept與公式15-Hypothesis tests of the slope coefficient之間的用法區(qū)別是?
【回復(fù)】公式15是斜率估計(jì)值b1cap(estimated slope coefficient)的T.S.(test statistic)檢驗(yàn)統(tǒng)計(jì)量計(jì)算公式,公式17是截距估計(jì)值b0cap的標(biāo)準(zhǔn)誤(standard error of the intercept)計(jì)算公式
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