Ordinary Least Squares (OLS) Problem

1) Indicate with your reasoning which of the following models can be estimated using Ordinary Least Squares (OLS), where X, Y, Z are variables and α, β, γ are coefficients to be estimated: ... *(Please see attachment for models)

Prove Math (Without Regression as a Proof)

I can prove this problem using regression, but I don't have an equation for it. Please help, thanks! a.) Suppose you multiply all X1 values by 2 in an equation with one independent variable (X1) and a constant. What will be the effect of this rescaling, if any, on the coefficients (SYMBOL1 and SYMBOL2) and their standard errors? Prove your answer mathematically (You are not supposed to use run/calculate a regression as a proof). *(Please see attachment for proper symbols)

Selecting Ind. Variables

I need some assistance identifying some independent variables please help, thanks.

Identifying variables for regression

Please help me identify a few variables for my assignment. I also want to understand why the variables were chosen. I need feedback, thank you.

Please help assess each VP's recommendation regrading sound-card production levels.

I have outlined three products, I was given an income statement ( labeled before), next I created a revised Economic P&L. I did two interviews one with Michael Espinosa, the other with Rachael Dixon. I am interested in an assessment of each VP's recommendation regarding sound-card production levels, including an analysis of each VP's argument and an explanation of which assumptions are correct or incorrect.