Casual relationship based on correlation research
What are the two reasons you can't conclude you have demonstrated a casual relationship based on correlation research?
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A large midwestern state administers a statewide mathematics exam that has an average of 500. A researcher is designing a study to test the idea that students from charter schools score higher than average on the test.
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A crate of weight W is being pushed across a horizontal surface by a force directed at an angle of 20 degrees below the horizontal. What is the magnitude of the normal force on the crate?
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