MGT 6203

MGT 6203 FINAL EXAM PART 2 – CODING 1. Using the function lm, create a linear regression that regresses “Rings” onto “Diameter” and “Height” (i.e., “Rings” is the response variable and “Diameter” ,“Height” are the independent variables). Which one of the following statements is FALSE? a. Diameter is significant at a 5% Confidence Interval b. R-Squared is 0.35 c. The intercept is 11.71 d. One unit of change in height causes the number of rings to increase by 19.81 on ...

MGT 6203 FINAL EXAM PART 1 Q1. If the explained sum of squares is 35 and the total sum of squares is 49, what is the residual sum of squares? A. 10 B. 14 C. 12 D. 18 Solution: B Explanation: Total Sum of Squares = Explained Sum of Squares + Residual Sum of Squares SST = SSE + SSR SSR = SST – SSE = 49 – 35 = 14 Q2. Consider a regression model predicting the amount someone has spent (on some arbitrary product) based on their salary and age. To improve the model we have created an interacti...

MGT 6203 Midterm Part 1 - Questions and Answers Q1) What is the adjusted R-squared: A. 0.681 B. 0.6772 C. 0.6778 D. 0.3228 Ans: B: 1-[((1-0.681)*(506-1))/(506-6-1)] or 1-[(13625.6/499)/(42716.3/505)] From Wk1 Page 19 Slide 1

Homework 1 - Solutions Question 1 Choose the correct statement regarding the sum of residuals calculated using Ordinary Least Squares (OLS). A. The sum of residuals will always be nonzero whatever the form of the linear regression as long as you are using OLS to estimate the coefficients. B. The sum of residuals will always be equal to zero if you include intercept term in your model and you are using OLS to estimate the coefficients C. The sum of residuals may or may not be zer...

Self-Assessment #5 – Week 9 Content Questions 1-5 are based on the Paper: “Advertising experiments at the Ohio Art Company” 1. In 1999, product placement of Etch-A-Sketch in the movie sequel Toy Story 2 helped boost the sales of the drawing toy by? a. 25% b. 20% c. 30% d. 35% Answer: B 2. According to the paper, which of the following had the highest market share in the toy industry? a. Toys”R”Us b. Target c. Walmart d. Traditional specialty toy stores Answer: ...

Week 12: Self Assessment 7 Due Apr 10 at 11:59pm Points 10 Questions 10 Available Mar 20 at 8am - Apr 10 at 11:59pm 22 days Time Limit None Allowed Attempts Unlimited Instructions Self Assessment 7 covers the topics in Week 12 and is worth 1% of your overall grade. You may work on the homework for as long as you like within the given window. Please note that your answers will automatically save as you key them and you are allowed multiple attempts. Again, please note, you s...

MIDTERM – SOLUTION KEY CODING QNS Q21) Please estimate a linear regression model (using the lm function) with Personal as the dependent variable and Room.Board as the independent variable. What are the model’s Rsquared and adjusted R-squared values? a) 0.00549, 0.048 b) 0.0143, 0.022 c) 0.0398, 0.0385 d) 0.0325, 0.0336 Answer: C (Week 1 Lesson 4) library("ISLR") data("College") summary(lm(College$Personal~College$Room.Board)) ## ## Call: ## lm(formula = College$Personal ~ Co...

MIDTERM – SOLUTION KEY THEORY QNS *Q1) Consider a linear regression model with 2 independent variables (assume both are correlated with the response variable). If we add an interaction term between the independent variables to the model, how will the model be affected: A) The R2 will increase (or remain the same) with certainty while the adjusted R2 can increase or decrease B) Both the R2 and adjusted R2 will increase with certainty. C) The R2 will decrease (or remain the same) with cert...

MGT6203_Final Part1 - Spring

MGT6203_Final Part1 - Spring