Suppose a researcher is performing an experiment on children. She tests the children on one level of the independent variable at the beginning of the school year, but cannot return to test the second level until mid-April, when the school year is almost completed. What threat to internal validity may be a problem

The answer is "Maturation".

Explanation:

When we develop and evolve, we go thru a process called maturity. There are many different types of maturity, including physical and cognitive. As people age, our bodies expand and change, and it is called physical maturity. Cerebral maturity is the mechanism by which our sufficient detail increases as people mature. The educators should share, discuss, and agree upon their goals for student accomplishment and advancement.

there are conflicting perceptions. what cannot be denied is that despite a long history of discrimination, they finally chose to bow out in grace and handed over power to the majority. it was a painful experience for them to part with their prerogatives and some chose to leave the country. however, they did decide to bite the bullet and go through the process with minimum obstructions.

presently, whites are still a force to reckon with. they are well educated, have technical and business expertise, they understand imperatives of good governance and are responsible for keeping south africa connected with developed countries. despite a bitter history, they are useful team members of the south african team.

this can !    

- jack watson