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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Anleitung zur Übung

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.

Interaktive Übung

Vervollständige den Beispielcode, um diese Übung erfolgreich abzuschließen.

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

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