Typos -- ECON326 Module 2

[loforteg]

I've seen a couple of small typos here and there in Module 2 of the ECON326 folder.

• $M_i$ and $W_i$ in $(\hat{\beta_0},\hat{\beta_1})$ formula, instead of $W_i$ and $I_i$
• $E[W_i|G_i = \text{Male}]$ and $E[W_i|G_i = \text{Female}]$ are inverted in the first block of equations in Part 2
• $\beta_1 = E[W_i|G_i = \text{Female}] - E[W_i|G_i = \text{Male}]$ instead of $\beta_1 = E[W_i|G_i = \text{Female}] - E[W_i|G_i = \text{Male}] = \beta_1 - \beta_0$
• In the description of Activity 1 in Part 3, the Tested objects should be regm and regf