Final answer:
Demographers will need to increase their population predictions due to the dropping birth rate in Idaho.
Step-by-step explanation:
The scenario described suggests that the birth rate in the state of Idaho is decreasing and will continue to do so for the next fifteen years. This new trend contradicts previous population trends in the state. Consequently, demographers will need to adjust their population predictions and increase them to account for the declining birth rate.
Learn more about impact of declining birth rate on population predictions