Direct Observation, Indirect Observation, Random Sampling and lastly, Mark-and-recapture study.
Answer:c- It will still weigh 15 grams
Explanation:
Given
Fifteen gram of a liquid plastic are frozen in a physical change that increases the volume.
It is certain that the mass of plastic will remain fifteen grams despite the increase of volume as density of the plastic will automatically adjusted to get same mass

Answer:
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Explanation:
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Answer:
external
Explanation:
The process of applying the conclusion of a particular scientific study into a study which is outside its context is said to be external validity. The conclusions derived in one particular study is applied to other situations through external validity. There are cases when such generalization brings a negative result to the study. Also, the factor of generalization is limited to some extent.
Answer:
The complete question is a multiple choice question, however the answer is:
self generated mediators of generalization
Explanation:
A mediator of generalization is a a stimulus that is maintained and transported by the client as part of treatment. It can be physical stimulus or a behavior which controls the behavior of the target.
Example include a parent attend a lecture on children management and then after implementing the techniques, they guide the behavior of their own child.