Now run a multiple linear regression with Happiness as the "Y" variable on Income, Age and Education as the "X" variables. That is, estimate

You have estimated a number of regression models: 

The coefficient on Income declined as we went from models (1) to (2) to (3). Consider the statements below and select those that are correct. (Multiple answers allowed)

Estimate a multiple linear regression with Happiness as the "Y" variable and Income and Age as the "X" variables. Do not include Education in the model.  That is, estimate

What is the correlation between Income and Age? (Report to 4 decimal places)

Calculate the correlation between each of the four variables with all the other variables.

What is the correlation between Happiness and Income? (Report to 4 decimal places)

Instructions:

The easiest way to do this is to use Excel's Data Analysis Toolpak. Go to the "Data" tab, select the "Data Analysis" option on the far right and then select "Correlation". Fill out the dialogue box appropriately. 

You can also use the "=CORREL()" function but this will take much longer. 

Produce a scatter plot between Income

and