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.
This exercise is part of the course
Foundations of Inference in R
Exercise instructions
- Use the
count()
function to tabulate the dataset calledopportunity
. Make a note of the values in thedecision
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"
.
Hands-on interactive exercise
Have a go at this exercise by completing this sample code.
# Tabulate the data
opportunity %>%
___(decision, group)
# Find the proportion who bought the DVD in each group
opportunity %>%
group_by(___) %>%
summarize(buy_prop = ___(___))