Let $\hat { Y } = \hat { \beta } _ { 0 } + \hat { \beta } x ^ { + }$ where $x ^ { + }$ is some fixed value of x. Then, the mean value of $\hat { Y }$ is $E ( \hat { Y } ) =$ __________.

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The Answer of Let $\hat { Y } = \hat { \beta } _ { 0 } + \hat { \beta } x ^ { + }$ where $x ^ { + }$ is some fixed value of x. Then, the mean value of $\hat { Y }$ is $E ( \hat { Y } ) =$ __________.

Let Y^=β^0+β^x+\hat { Y } = \hat { \beta } _ { 0 } + \hat { \beta } x ^ { + }Y^=β^​0​+β^​x+

Let $\hat { Y } = \hat { \beta } _ { 0 } + \hat { \beta } x ^ { + }$