Your Coworker Has Computed the Unexplained and the Total Variation $Y = \sum _ { t = 1 } ^ { n } \left( \hat { Y } _ { t } - \bar { Y } \right) ^ { 2 } = 380$

Essay

Your coworker has computed the unexplained and the total variation in Y and asked you to compute the coefficient of determination Unexpl.var.in $Y = \sum _ { t = 1 } ^ { n } \left( \hat { Y } _ { t } - \bar { Y } \right) ^ { 2 } = 380$ Total.var. in $Y = \sum _ { t = 1 } ^ { n } \left( Y _ { t } - \bar { Y } \right) ^ { 2 } = 990$