The most popular adult Halloween costume of 2009 is D. a cat.
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.
Because it is unusual for the sun and the moon to cross
Answer:
A.
Explanation:
The Facial Feedback Hypothesis is the theory that states the facial expression affects one's emotional state. This theory is based on the theories developed by Charles Darwin and William James.
<u>To prove this theory right, an experiment with a pen or pencil was done. In this experiment, the participant was asked to hold a pen or pencil in the mouth between the teeth which will force the edges of the lips to raise tend to make the person smile. This activity will make the person feel happy according to the facial feedback hypothesis. This hypothesis suggests that the facial expressions have the power to change the emotional state of a person as well</u>.
So, the correct answer is option A.
