Joe is going to study how prisoners behave in a counseling session, but they can't see him as he is behind a shaded window. joe is using as the basis for this study.

Non-participant observation

Explanation:

Non-participant observation is the observation in which a researcher observes his participants for his study with their knowledge. But the researcher will not take an active role in the research. This research has been criticized many times. In observation, people behave differently every time. Data collection will be invalid. Hawthorne effect is the example of non-participant observation.  

Thus Joe is going to study how prisoners are behaving in the therapy session and prisoners don't know someone is observing them is the example of the study of non-participant observation.

two jet streams that directly affect the formation of weather in the continental part are a polar jet and a subtropical jet. they are responsible for the transportation of weather systems, which directly affect people. the polar front is the boundary between cold air from the north pole and warmer equatorial air. both the polar jet and the subtropical jet blow from the west to the east, and follow the boundary between cold and warm air.

the strongest jet streams are polar jets, while subtropical jets are somewhat weaker.

the right answer is c. the polar jet stream is generaly stronger than the subtropical jet stream.

answer; not counted as an offense known to the police;