clean up quartets slides

Author: malcolmbarrett

exercises/05-quartets-exercises.qmd

@@ -8,9 +8,7 @@ format: html
 library(quartets)
 ```
 
-If you don't already have it, install the `quartets` package: `install.packages("quartets")`
-
-## Your turn
+## Your turn 1
 
 For each of the following 4 datasets, look at the correlation between `exposure` and `covariate`: 
 
@@ -45,11 +43,3 @@ For each of the following 4 datasets, fit a linear linear model examining the re
 * `causal_mediator_time`
 * `causal_m_bias_time`
 
-## Stretch goal
-
-Use the "g-computation" method to examine the causal effect of a change in exposure from 0 to 1 for each of the datasets. How does this compare to the results above? 
-
-```{r}
-
-```
-