University Level Quantitative Analysis Question

Please help by providing a clear and detailed explanation of all the solutions. I want to understand why the answers are what they are. Thank you.

Intl = 1 if the student is from outside Canada and 0 otherwise.

Canada = 1 if the student is Canadian but from outside Ontario.

We had also observed that summer earnings appeared to be lower in 2020 than in 2019.

Class01 = 1 if the student is in the 2020 class and 0 if s/he was in the 2019 class.

Often when looking at earnings data, we observe that earnings are lower for females.

Gender01 = 1 if female and 0 if male

Question:

Being provided with the correlations among the variables: HSAvg, Age, Intl, Class01, Gender01, Canada, Summer$ gives the following results:

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