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.
Marigold was a psychologist who loved to study the abilities of human memory in remembrance of important events in her life. He preferred to take the test developed in it, where on a card, she wrote an event importing, and behind it, the date and level of importance. Every time she performed these tests, she needed to think about her ups and downs, and that makes her a bit depressed.
I believe the answer is: Iconic memory
Iconic memory refers to the type of memory that taken from one of our senses which last on a very short period of time before it fades.
Iconic memory happens because of the mix-up between short-term memory and long-term memory and would explain weird psychological occurrences such as De javu.
<span>The USSR was made up of 15 countries. Out of them, the "Russian Republic" was the largest, making of 75% of the area and 50% of the population.</span>
