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.

Deze oefening maakt deel uit van de cursus

Foundations of Inference in R

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Oefeninstructies

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.

Praktische interactieve oefening

Probeer deze oefening eens door deze voorbeeldcode in te vullen.

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

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