Question 39 (4 points) What is the Excel function used for dummy-variable coding? Stdev.s function OvLookup function O IF function Dummy Function O Pivot function Based on the following information, answer the next 2 questions: You're looking at how the different Sales Promotions affect Sales. Thus, the IV is the type of sales promotion. It has 3 levels: 1) Discounts, 2) Free Shipping/Free Returns, and 3) Loyalty Programs. The DV is the average daily sales during the promotion (in $). Question 40 (4 points) Saved How many dummy variables will you have to code for, to fully identify every level of the IV: "Promotion type". 4 3 2 1 Question 41 (4 points) If the dummy-coded variable for "Discounts", reads 1, for day-20, what does that mean? Hint: Any dummy coded variable takes only two values: 0 and 1. On day 20, the "Discount type" promotion was running. Only 1 type of sales promotions was running on day 20. On day 20, the "Discount type" promotion was NOT running. The sales on day 20 was $1