tc = 2 怎么算出来的

NO.PZ202306130100003402 问题如下 ug Abitbol is a portfolio manager for Polyi Investments, a hee funthtras in the UniteStates. Abitbol manages the hee funwith the help of Robert Olabu, a junior portfolio manager.Abitbol looks economists’ inflation forecasts anwoullike to examine the relationship between the US Consumer PriInx (US CPI) consensus forecast anthe actuUS CPI using regression analysis. Olabu estimates regression coefficients to test whether the consensus forecast is unbiase If the consensus forecasts are unbiase the intercept shoul0.0 anthe slope will equto 1.0. Regression results are presentein Exhibit 1. Aitionally, Olabu calculates the 95 percent prection intervof the actuCPI using a US CPI consensus forecast of 2.8.Finally, Abitbol anOlabu scuss the forecast anforecast interval:■ Observation 1. For a given confinlevel, the forecast intervis the same no matter the US CPI consensus forecast.■ Observation 2. A larger stanrerror of the estimate will result in a wir confininterval. Baseon Exhibit 1, Olabu shoulcalculate a prection intervfor the actualUS CPI closest to: A.2.7506 to 2.7544. B.2.7521 to 2.7529. C.2.7981 to 2.8019. A is correct. The forecast intervfor inflation is calculatein three steps:Step 1. Make the prection given the US CPI forecast of 2.8:Step 2. Compute the varianof the prection error: US CPI consensus forecast 是 2.8，下面的meof US CPI consensus forecast 是1.335，这两个分别是什么意思？为什么相差这么多？

NO.PZ202306130100003402问题如下 Baseon Exhibit 1, Olabu shoulcalculate a prection intervfor the actualUS CPI closest to: A.2.7506 to 2.7544.B.2.7521 to 2.7529.C.2.7981 to 2.8019. A is correct. The forecast intervfor inflation is calculatein three steps:Step 1. Make the prection given the US CPI forecast of 2.8:Step 2. Compute the varianof the prection error: 用假设的CPI 2.8计算得出的2.7525不是PPI吗？怎么又成CPI了