May 17th, 2022 
Carefully review the slides in pages 22 ~ 39 of W7(Period2), and do the followings in Radiant and create a report in a word document
1. Visualization
Obtain scatter plots of Sales vs. Price, and Sales vs. Ads, and explain the relationship from your visual inspection of data
Obtain bar plots of Sales by Thanksgiving and Christmas, and explain and interpret the differences
2. Effects of control variables
Regress Sales on Price, then interpret the coefficient
Regress Sales on Price, Thanksgiving, then explain how coefficient changes
Regress Sales on Price, Thanksgiving, Christmas then explain how coefficient changes
Repeat this for Ad Spend instead of Price
3. Regression analysis
Regress Sales on Price, Ad Spend, Thanksgiving, and Christmas
Interpret all four coefficients
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