Update regression topic to include background materials from cross val project #1130
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Description:
What are you up to?I made this topic a hard prerequisite for cross-validation and simple linear regression so learners will go through all the materials needed for them to understand the project cross validation and simple linear regression. This topic has R-Squared resources, R-Squared is a concept that some learners have struggled with in the past.
I solemnly swear that: