Quasi experimental research

Imagine that a group of obese children is recruited for a study in which their weight is measured, then they participate for 3 months in a program that
encourages them to be more active, and finally their weight is measured again. Explain how each of the following might affect the results:
1) regression to the mean
2) spontaneous remission
3) history
4) maturation
How might you adjust the study (or put in safeguards) to address these issues?

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