Explore BrainMass

Regression Analysis

Plantworld: develop a regression model to explain and predict supplies expense

Plantworld is a large nursery and retail store specializing in house and garden plants and supplies. Tito Nieves, the assistant manager, is in the process of budgeting monthly supplies expense for the next 12 months. He assumes that in some way supplies expense is related to store hours, sales dollars or employee hours worked


In regression analysis, the omission of one or more significant explanatory variables from the regression equation constitutes: a multicollinearity b autocorrelation c specification error d heteroscedasticity e none of the above


(See attached file for full problem description) --- Q: The following data is given: Date Advertising Price Quantity January 25 12500 15 February 30 12200 17 March 26 11900 16 April 28 12000 18 May 27 11800 20 June 29 12500 18 July 28 11700 22 August 30 12100 15 September 24 1

Outline - General Motors Economic Affect

Outline Forecasting is an essential tool in any decision making process. There are various techniques of forecasting. I Regression analysis is used to forecast revenues and expenses: Regression analysis is any statistical method where the mean of one or more random variables is predicted conditioned on other (measured) r

How might you go about creating a stronger regression model?

How might you go about creating a stronger regression model? For example, you have a multiple regression model with an adjusted R-Square of 0.49, which would explain 49% of the variance of the dependent measure, and you would like to explain 70% of the variance of the dependent measure.

Monthly sales forecasting

The Gametime Hat Company manufactures baseball caps that have various team logos in an assortment of designs and colors. The company has had monthly sales for the past 24 months as follows. Month Demand (1,000s) 1 8.2 2 7.5 3 8.1 4 9.3 5 9.1 6 9.5 7 10.4 8 9.7 9 10.2 10 10.6 11 8.2 12 9.9 13 10.3

Value of the Regression Coefficient

Please only supply a solution if it can be typed using software such as mathtype. --- The regression line of y on x for n pairs of data has the equation . If the data is coded by means of the relations: what restrictions, if any, must be placed to ensure that the value of the regression coefficient b is unaffected? ---

Regression and frequency tables.

Please find attached problem and excel worksheet that relates. --- (a) The regression line of y on x for n pairs of data has the equation . If the data is coded by means of the relations: what restrictions, if any, must be placed on and to ensure that the value of the regression coefficient b is unaffected?

Questions and Problems

1. Regression analysis is a statistical procedure for developing a mathematical equation that describes how: a. one independent and one or more dependent variables are related b. several independent and several dependent variables are related c. one dependent and one or more independent variabl

Regression Problem - Job Satisfaction

Work through a simple regression calculation using intrinsic job satisfaction and extrinsic job satisfaction. (intrinsic job satisfaction being the independant variable and extrinsic job satisfaction being the dependant variable) Represent the equation as y = bx + a. The data set for intrinsic and extrinsic job satisfaction

Using Regression to Study Recent Loans of a Large Bank

A mortgage department of a large bank is studying its recent loans. Of particualr interest is how such factors as the value of the home (in thousands of dollars), education level of the head of the household, age of the head of the household, current monthly mortgage payment (in dollars), and gender of the head of the household

Regression Model and Graphng

View the enclosed graph and data set Write an equation of the form y=mx +b for your graph model and explain what the value of m tells you about this situation. Building Stories Height Indiana Bell Telephone Bldg. 20 320 National City Center 23 301 Los Angeles City Hall 28 454 Pacific Tower 30 350 United Nations Buildi

Regression and Correlation

52. Refer to the Baseball 2000 data (Appendix D), which reports information on the 2000 Major League Baseball season. a. Let the games won be the dependent variable and total team salary, in millions of dollars, be the independent variable. Can you conclude that there is a positive association between the two variables? D

Underlying average of a time series

When the underlying average of a time series is very stable and there is no trend, cyclical, or seasonal influences: a. A simple moving average forecast with n = 20 should outperform a simple moving average forecast with n = 3. b. A simple moving average forecast with n = 3 should outperform a simple moving average forecast wi

Forecasting & Scatter Diagrams

I need help with these questions: An advantage of exponential smoothing over a simple moving average is that exponential smoothing requires one to retain less data. True False Which of the following statements about scatter diagrams is true? Time is always plotted on the Y axis. It can

Multiple regressions and variables

Discussion of multiple regression with the topics from Dielman Terry 'Applied Regression Analysis' - A 2nd course in Bus. and Economic Statistics. Topics (title of chapters) to cover: - Multiple regression analysis - Fitting curves to data - Assessing the assumptions of the regression model - Using indicator and interact

The Owner of Maumee Motors

The owner of Maumee Motors wants to study the relationship between the age of a car and its selling price. Listed below is a random sample of 12 used cars sold at Maumee Motors during the last year. A). If we want to estimate selling price based on the age of the car, which variable is the dependant variable and which is th

Survival, correlation, and regression

1. Variables x and y each have standard deviations of 20. Their correlation is 0.6. The best fit line passes through the Y axis at Y = 40. Write the regression line. If a subject is 10 on x, what do you predict for Y? 2. You are looking through a book of new car ratings, and you decide to see how car weight influences EPA

Regression Analysis

Sales and Advertising expenses are used for the simple regression data attached. Sales is the dependent variable and Advertising Expense is the independent variable. The results are on the spreadsheet, with the relevant items in boldface. In practical terms, - How do I convert the above information to an equation I can

Various statistical problems

Please complete the following 5 questions in a Microsoft Word file: 1. When is it appropriate to use a time series approach to a business setting? When can it be applied to project management? 2. What are examples where control charts are used in your workplace to monitor quality control? What are the goals and objectives

Regression and business

(See attached file for full problem description with diagrams) --- 2. The following sample observations were randomly selected. Determine the coefficient of correlation and the coefficient of determination. Interpret. 3. Bi-lo Appliance Stores has outlets in several large metropolitan areas. The general sales manager

Relating statistics to solve business related problems

Need guidance on how to approach a statistics paper. Problem: utilize statistics to solve a business related problem. The synopsis should include a discussion of the specific problem, the research methodology used, the quantitative and qualitative tools employed in the study, and the benefit and limitations of the research stud

Regression to the mean

We expect that students who do well on the midterm exam in a course will usually also do well on the final exam. Gary Smith of Pomona College looked at the exam scores of all 346 students who took his statistics class over a 10-year period. *The least-squares line for predicting final exam score from midterm exam score was y

Linear regression and Correlation

A. What is linear regression? b. What can linear regression do for you - both in a general business sense and specifically to your place of employment, or circle of influence? c. What are some of the limitations of regression analysis? a. What is correlation analysis and why is it important to us when we are using regres