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.
It is attractive to those who are in the insurance business
or are engaged in affiliate programs.
Each time customers buy from these companies, they gain income and
continue to do so as long as the account continues to be working.
Answer:
https://www.history.com/topics/native-american-history/native-american-cultures
Explanation:
go to this website
The sentence that follows the AP Style Guide rules in which
this rule is usually used in means of having a sentence to use lower case
letters and capitalizing is only used when needed, the correct answer in the
statements given above is letter a, it is because a name is always capitalized where
as it follows it does not need as it does not mention anything that needs capitalizing.
