b$.$ Develop a causal regression model to forecast demand that includes both time and the introduction of a new chip as explanatory variables.

Demand $=3141\mathrm{.}598+(536\mathrm{.}407)*$ month $+(4956\mathrm{.}617)*$ New Chip Introduced

$($Type integers or decimals rounded to three decimal places as needed.$)$

c$.$ What would the forecast be for the next month if a new chip is introduced? What would it be if a new chip is not introduced?

If a new chip is introduced, the forecast for month $25$ would be

If a new chip is not introduced, the forecast for month $25$ would be

$($Round to the nearest whole number as needed.$)$