adding gut checks

modules/Data_Visualization/Data_Visualization.Rmd

@@ -469,6 +469,21 @@ er_visits_4 %>% ggplot(aes(x = year,
 -   `scale_x_continuous()` and `scale_y_continuous()` can modify the scale of the axes
 -   by default, `ggplot()` removes points with missing values from plots.
 
+## GUT CHECK: If we get an empty plot what might we need to do?
+
+A. Add a `plot_` layer like `plot_point()`
+
+B. Add a `geom_` layer like `geom_point()`
+
+
+## GUT CHECK: How do we add more layers in ggplot2 plots?
+
+A. `%>%`
+
+B. `&`
+
+C. `+`
+
 ## Lab 1
 
 🏠 [Class Website](https://daseh.org/)
@@ -953,6 +968,20 @@ ggsave(filename = "saved_plot.png",  # will save in working directory
        width = 6, height = 3.5)               # by default in inches
 ```
 
+## GUT CHECK: How to we make sure that the boxplots are filled with color instead of just the outside boarder?
+
+A. Use the `fill` argument in the `aes` specification 
+
+B. Use `color` argument in `geom_boxplot()`
+
+## GUT CHECK: If our plot is too complicated to read, what might be a good option to fix this?
+
+A. add more `theme()` layers
+
+B. Use `facet_grid()` to split the plot up
+
+
+
 ## Summary
 
 -   The `theme()` function helps you specify aspects about your plot