Plotting opportunity cost

Again, interest is in whether the treatment and control groups were equally likely to buy a DVD after reading the experimental statements. Here, you'll create a barplot to visualize the difference in proportions between the treatment and control groups.

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Foundations of Inference in R

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Instrucciones del ejercicio

Using the opportunity dataset, plot group filled by decision.
Call geom_bar() to add a bar plot layer, setting the position argument to "fill" to compare relative frequencies. Note that fill should be defined by the decision for each group.

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# Plot group, filled by decision
ggplot(opportunity, aes(x = ___, fill = ___)) + 
  # Add a bar layer, with position "fill"
  ___

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