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.
Answer:
Validity
Explanation: validity shows an indication of how sound your research is. Specification speaking , it applies to both the design and the methods of your research. When considering data collection validity means that your findings truly represent the situation you are claiming to measure.
Supposing Melissa wants to earn a high salary from her new job she should choose to be a financial analyst at a large corporation. A financial analyst in a large corporation as her vehicle will generate a better income and assures her that she'll be paid for her hard work.
All but the first one, "Never purchase a warranty."
Because prisons are overcrowded and prisoners may be released early.
