Does smoking marijuana significantly impact brain development at the young age of 18 vs smoking it at the older age of over 21?

Write the answers to these questions in complete sentences. Make sure to have all the components of contain the Independent Variable, Dependent Variable, and the Population of study).

1) Talk about the Assumptions of the t test you chose (either Paired or Independent Samples t Test. (4 points)
2) What is your research question? (contains the Independent Variable, Dependent Variable, and the Population of study). (3 points)
Based on your Research Question:
3) State the null hypothesis (contains the Independent Variable, Dependent Variable, and the Population of study). (2.5 points)
4) State the alternative hypothesis (contains the Independent Variable, Dependent Variable, and the Population of study). (2.5 points)
4) Talk about what it means if you fail to reject the null hypothesis in terms of your study. (4 points)
 
5) Talk about what it means if you reject the null hypothesis in terms of your study. (4 points)
I don’t know which test would be good for this nor the variables so since you are the expert ill leave that up to you. 

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