Question: 3. Binary variables such as placebo or not placebo can be included as a dependent variable in a linear model by calling: (a) lm( formula

3. Binary variables such as placebo or not placebo can be included as a dependent variable in a linear model by calling:

(a) lm( formula = y ~ placebo + x, data = somedataset )

(b) geom_smooth( placebo )

(c) lm( formula = placebo ~ y + x, data = somedataset )

(d) geom_smooth( aes( y = y, x = placebo ) )

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