feat(lec06): release

Author: yanlisa

…observational-studies/deprecated-eda.qmd 06-variables-ii/deprecated-eda.qmd06-observational-studies/deprecated-eda.qmd renamed to 06-variables-ii/deprecated-eda.qmd 06-observational-studies/deprecated-eda.qmd renamed to 06-variables-ii/deprecated-eda.qmd

@@ -67,12 +67,12 @@ website:
             text: "Variables and Variable Types"
           - href: 05-variables/units-of-analysis.qmd
             text: "Units of Analysis"
-      - section: "L06: Observational Studies"
-        href: 06-observational-studies/index.qmd
+      - section: "L06: Variables II"
+        href: 06-variables-ii/index.qmd
         contents:
-          - href: 06-observational-studies/index.qmd
+          - href: 06-variables-ii/index.qmd
             text: "Causality vs. EDA"
-          - href: 06-observational-studies/sample-population.qmd
+          - href: 06-variables-ii/sample-population.qmd
             text: "Sample vs. Population"
       - href: five-things.qmd
         text: "5 Things to Know"

…servational-studies/deprecated-index.qmd 06-variables-ii/deprecated-index.qmd06-observational-studies/deprecated-index.qmd renamed to 06-variables-ii/deprecated-index.qmd 06-observational-studies/deprecated-index.qmd renamed to 06-variables-ii/deprecated-index.qmd

@@ -59,6 +59,7 @@ In the function above, `my_function` is the name of the function, which takes on
 | `np.append(arr, item)` | Appends `item` to the end of `arr`. Does not modify the original array. | 1. **array** to append to <br> 2. item to append (any type) | **array**: a new array with the appended item |
 | `np.cumsum(arr)` | Returns the cumulative sum of the elements in `arr`, where each element is the sum of all preceding elements including itself | **array** | **array**: the cumulative sum of the values in the array |
 | `np.diff(arr)` | Computes the difference between consecutive elements in `arr`. | **array** | **array**: the differences between consecutive elements in the array containing `len(arr) - 1` elements |
+| `np.sort(arr)` | Sorts an array in ascending order. | **array** | `None` |