Sam’s I.Q. was 105 when he was tested at age nine. When he was thirteen, he was re-tested and his I.Q. was 120. Explain the increase in I.Q. using the concepts of trends/theories and socioeconomic factors.

2 answers

I don't know what your text materials say, but many things can affect a test score. I scored 20 points lower one evening when I was tired after a long day of taking care of my two small children.
Outside of fatigue, what other environmental factors effect IQ?

Were both administrations standardized? What is the reliability of that IQ test?

Did the socioeconomic factors improve?

https://en.wikipedia.org/wiki/Environment_and_intelligence

Don't just copy the material. Express the ideas in your own words. Although this will take more time and effort, you will learn more.