for least squares pm2 5 = β0+β1humidity+β2dewpoint+β3se+β4ne+β5nw+β6windspeed
if You suspect that the relationship between humidity and PM2.5 concentration may be a quadratic relationship.
what would the new equation be?
is it pm2 5 = β0+β1humidity+β2humidity^2+β3dewpoint+β4se+β5ne+β6nw+ β7windspeed
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