Answer the following: 1. Define what is a "variable", and explain the difference between quantitative and qualitative (categorical) variable. 2. Below are several sets of variables. Which of these are...

Extracted text: Answer the following: 1. Define what is a "variable", and explain the difference between quantitative and qualitative (categorical) variable. 2. Below are several sets of variables. Which of these are qualitative and quantitative? Please explain why. (short answers only) a. Peso amount on an accounts receivable invoice b. Net profit of San Miguel Corporation in 2020. c. The stock exchange on which MPI stock is traded. d. The national debt of the Philippines in 2020 e. Advertising medium (radio, social media, TV, print) use to promote vaccination.