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Comparison of Observational as well as Experimental Study Designs.

describe Standardized test scores.

For his Statistics class experiment researcher J.Gilbert obvious to study how parent's income affects children's performance on standardized tests like the SAT. He anticipated to collect information from a random sample of test takers as well as examine the relationship between parental income as well as SAT score.

1) Is this an experiment? If not, what kind of study is it?

2) If there is relationship between parental income and SAT score why can't we conclude that dissimilarities in score are caused by differences in parental income?

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