A statement is made about correlation. State whether the correlation is positive or negative and whether the correlation is most likely due to coincidence, a common underlying cause, or a direct cause.People with higher incomes tend to live longer than those with lower incomes.
A. Positive correlation; coincidence
B. Negative correlation; common underlying cause
C. Positive correlation; direct cause
D. Positive correlation; common underlying cause
Answer: D
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, with A in quadrant I, and 
with B in 
A. 
B. 
C. 
D. 
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A. 7 hundred thousands B. 7 thousands C. 7 hundreds D. 7 ten thousands
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Find the missing monomial, factor or term.(x + ?)(x + ?) = x2 + 9x + 18
A. -3, 6 B. 3, -6 C. 3, 6 D. -3, -6