A researcher decides to investigate whether there are any changes in people's IQ scores from early adulthood through middle adulthood. He begins with a sample of 21-year-olds and plans to follow this group until they are 50 years old. The type of research design he is planning to use is called

This is called an "OBSERVATIONAL RESEARCH".

Explanation: An Observational research is a type of research were we get our result by observing samples act on it own natural course, without influencing it with any substance. We have two type of research design, Experimental and Observational research design.

Because the researcher has chooses a particular group and decide to observe them, grow and act on their natural course, without giving any substance to them, his research model is Observational.

Experimental research design is when a substance is added to a sample to compare it with another sample

both are monotheistic however, christians believe jesus is the savior and jews believe jesus is just another prophet.

explanation:

answer; i do believe that the employee must do the adjusting;