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  3. Foundations of Inference in R

Exercise

Summarizing opportunity cost (1)

As you saw in the video, we're interested in whether the treatment and control groups were equally likely to buy a DVD after reading the experimental statements.

In this exercise, you'll use the data from the study to find the sample statistics (here: proportions) that are needed for the analysis.

Instructions

100 XP
  • Use the count() function to tabulate the dataset called opportunity. Make a note of the values in the decision column for use in the next step.
  • For each experimental group, find the proportion who bought a DVD. That is, calculate the mean where decision is "buyDVD".