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FEV1i = β0 + β1 SMOKEi + β2 (AGEi-10) + β3 SMOKEi(AGEi - 10) + εi...

FEV1i = β0 + β1 SMOKEi + β2 (AGEi-10) + β3 SMOKEi(AGEi - 10) + εi

When the slope relating two quantitative variables is significantly positive, we say the two variables are positively related. When the slope relating two quantitative variables is significantly negative, we say the two variables are negatively related. Which statement is true regarding the relationship between AGE and FEV1? Group of answer choices

A. The relationship between AGE and FEV1 is positive for nonsmokers and negative for smokers.

B. The relationship between AGE and FEV1 is negative for smokers and also negative for nonsmokers.

C. The relationship between AGE and FEV1 is positive for smokers and negative for nonsmokers.

D. The relationship between AGE and FEV1 is positive for smokers and also positive for nonsmokers.

math   Statistics-And-Probability   
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