Overview of updates on the Assignment 1 Report

[oskarymd]

Here are steps we took to improve the original report:

1. Revising introduction and motivation.
2. Adding data cleaning in data description.
3. Updating expected findings for four new questions.
4. Replacing previous work with new questions and findings. The new questions are inspired by interesting findings from previous report. The new questions not only cover the topic in previous work, but also expend the prospective of analysis.
5. Adding a brief conclusion based on the current findings.
6. A limitation and recommendation are provided.
7. Revising reference.