What scientific term is a well-tested explanation for a set of observations or experimental results?

The correct answer will be- A scientific theory.

Explanation:

A scientific theory is a substantiated idea which provides a deep explanation of any natural event.  A theory is an elaborate form generalized or proposed hypothesis which explains the phenomenon to a limited extent.

A theory is formed by combining many proved hypothesis which provides evidence as well as supports the hypothesis. The theory is accepted only after it has been proved by the experiments of the researcher and fellow scientists.

Thus, A scientific theory is the correct answer.

this allows people to make the best decision or pursue the best option. when alternatives are weighed using their advantages and disadvantages, the option whose disadvantages outweigh the advantages (based on a qualitative or quantitative analysis) are shunned while those whose advantages outweigh their disadvantages are pursued.  

waves moving from a fast medium to a slow medium will experience a reflection as light travels more slowly than red light. total internal reflection occurs when the critical angle is.