Final answer:
The scientific method for the beet-root vs. salt de-icing experiment includes observation, questioning, research, hypothesis formation, and testing. Reliable results require controlled conditions, repetition, and peer review. Recommendations to the city council would consider the experiment's findings and factors like cost and environmental impact.
Step-by-step explanation:
To ensure the results of the experiment are reliable, one must use controlled variables, repeat the experiment multiple times, and peer review the findings. As for the recommendation to the city council, it would depend on the results of the study, but factors such as cost, environmental impact, and effectiveness compared to salt would need consideration.
Reliability comes from methodological rigor, such as properly controlling variables, repeating the experiment to ensure consistency, and having the results peer-reviewed. As for the recommendation on using beet-root extract, it's crucial to weigh the experiment's results alongside factors like cost-efficiency, environmental safety, and practicality for widespread use before advising the city council to make a change.