The manufacturer of Beanie Baby dolls used quarterly price data for 2012I - 2020IV (t = 1,...,36)and the regression equation $P _ { t } = a + b t + c _ { 1 } D 1 _ { t } + c _ { 2 } D 2 _ { t } + c _ { 3 } D 3 _ { t }$ to forecast doll prices in the year 2021. $P _ { t}$ is the quarterly price of dolls,and $D 1 _ { t } , D 2 _ { t }$ and $D 3 _ { t }$ are dummy variables for quarters I,II,and III,respectively. In any given year price tends to vary from quarter to quarter as follows:

Question

The manufacturer of Beanie Baby dolls used quarterly price data for 2012I - 2020IV (t = 1,...,36)and the regression equation $P _ { t } = a + b t + c _ { 1 } D 1 _ { t } + c _ { 2 } D 2 _ { t } + c _ { 3 } D 3 _ { t }$ to forecast doll prices in the year 2021. $P _ { t}$ is the quarterly price of dolls,and $D 1 _ { t } , D 2 _ { t }$ and $D 3 _ { t }$ are dummy variables for quarters I,II,and III,respectively.  In any given year price tends to vary from quarter to quarter as follows:

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The Answer of The manufacturer of Beanie Baby dolls used quarterly price data for 2012I - 2020IV (t = 1,...,36)and the regression equation $P _ { t } = a + b t + c _ { 1 } D 1 _ { t } + c _ { 2 } D 2 _ { t } + c _ { 3 } D 3 _ { t }$ to forecast doll prices in the year 2021. $P _ { t}$ is the quarterly price of dolls,and $D 1 _ { t } , D 2 _ { t }$ and $D 3 _ { t }$ are dummy variables for quarters I,II,and III,respectively.  In any given year price tends to vary from quarter to quarter as follows:

The Manufacturer of Beanie Baby Dolls Used Quarterly Price Data Pt=a+bt+c1D1t+c2D2t+c3D3tP _ { t } = a + b t + c _ { 1 } D 1 _ { t } + c _ { 2 } D 2 _ { t } + c _ { 3 } D 3 _ { t }Pt​=a+bt+c1​D1t​+c2​D2t​+c3​D3t​

The Manufacturer of Beanie Baby Dolls Used Quarterly Price Data $P _ { t } = a + b t + c _ { 1 } D 1 _ { t } + c _ { 2 } D 2 _ { t } + c _ { 3 } D 3 _ { t }$