Final answer:
The appropriate target population for the cereal brand's in-home product usage test in Toronto would be the consumers in Toronto. The sampling frame would be a list or database of households in Toronto.
Step-by-step explanation:
The appropriate target population for the manufacturer of a new cereal brand conducting an in-home product usage test in Toronto would be the consumers in Toronto who would potentially buy and use the cereal. The sampling frame would be a list or database of households in Toronto that can be randomly selected to participate in the product usage test.