If you wanted to determine how children change over a 10-year period, you should use:

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A longitudinal approach is the best choice when studying how children change over a 10-year period because it involves following the same group of individuals over time and measuring changes in their behavior, thoughts, and emotions as they age. This approach allows researchers to examine individual differences in development and track the progression of development within each individual. A cross-sectional approach would involve comparing different age groups at one point in time, which does not provide information about individual differences or changes over time. An environmental approach is not relevant to studying developmental changes in children.

If You Wanted to Determine How Children Change Over a 10-Year