We’re creating most technology we use today. And creating the mathematical ways we still use till this day.
Answer:
c. Observational studies have both independent and dependent variables.
d. Observational studies can be used to test hypothesis.
Explanation:
Observational studies are ones in which a researcher makes observations about his thoughts and views. He observes the risk and other effects before actual test takes place. This is usually the initial phase of research where observations are made for suitability of certain things that are to be researched. There is initial feasibility test conducted to identify whether the further research process is beneficial or not.
Positive reinforcement. Because he leaves before everyone else
Explanation:
Chief Joseph was a Nez Perce chief who, faced with settlement by whites of tribal lands in Oregon, led his followers in a dramatic effort to escape to Canada.
