Ononot — A marketing model regresses weekly sales (in thousands) on:

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Linear Modelingmedium

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A marketing model regresses weekly sales (in thousands) on:

$x_1 =$ advertising spend (in thousands of dollars)

$x_2 =$ season (coded 0 = off-season, 1 = peak season)

$x_3 = x_1 \times x_2$ (interaction term)

The fitted equation is: $\hat{y} = 20 + 5x_1 + 15x_2 + 8x_3$

During peak season ( $x_2 = 1$ ), what is the predicted effect on sales for each additional $1000 spent on advertising?