From Kaplan:
Age is 1, so why wouldn’t we remove the variable “age”?
Age has a correlation of +1.00 with itself. The main diagonal will always be +1.00 to represent variances; the off-diagonal elements are the correlations between different variables.
That sir was a better explanation on “off-diagonal elements” then the two pages in the Level 1 textbook! Finally that term makes sense, thank you.
I know a lot of people who would answer B.
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