Reference no: EM131401385
Ages of couples, again. Has the trend of decreasing difference in age at first marriage seen in Exercise gotten stronger recently? Here are the scatterplot and residual plot for the data from 1975 through 2003, along with a regression for just those years.
a) Why is R2 higher for the first model (in Exercise)?
b) Is this linear model appropriate for the post-1975 data? Explain.
c) What does the slope say about marriage ages since 1975?
d) Explain why it's not reasonable to interpret the y-intercept.
Exercise:
Ages of couples 2003. The graph shows the ages of both men and women at first marriage. (www.census. gov)
Clearly, the pattern for men is similar to the pattern for women. But are the two lines getting closer together?
Here's a time plot showing the difference in average age (men's age - women s age) at first marriage, the regression analysis, and the associated residuals plot.
a) What is the correlation between Age Difference and Year?
b) Interpret the slope of this line.
c) Predict the average age difference in 2015.
d) Describe reasons why you might not place much faith in that prediction.
|
Ethics and business decision making
: In a 1-2 page paper, please post a brief synopsis of this video and how it pertains to our MGMT 390 course. Compare the video to Chapter 3 of our textbook, Ethics and Business Decision Making. What are some key points that you found interesting an..
|
|
Defining feature of correlational research
: A researcher conducts a study on the relationship between caffeine consumption and performance on a math test. What kind of study is this? Which of the following is the defining feature of correlational research
|
|
Recommendation on how to improve the selected issue
: Using the results of your external audit above, make a recommendation on how to improve the selected issue. Explain the expected results and how they will be measured.
|
|
Develop an introduction with a thesis statement for paper
: Develop an introduction with a thesis statement for the Final Paper. Create an outline of the major headings with a two- to three-sentence description of what you will discuss under each heading.
|
|
Predict the average age difference in 2015
: What is the correlation between Age Difference and Year?- Interpret the slope of this line.- Predict the average age difference in 2015.
|
|
A set of sql statements that returns all rows
: Design and develop the below queries using professional principles and standards:A set of SQL Statements that returns all rows and all data for each table in your database.Two SQL Statements that return a subset of columns and a subset of rows using ..
|
|
Basic knowledge of the court systems
: Managers and business owners must have a basic knowledge of the court systems. Describe the court structure in the United States. Why is it essential for a manager or business owner to know the court systems?
|
|
Estimate the convection heat transfer rate
: If the annular space is pressurized with nitrogen at 5 atm, estimate the convection heat transfer rate per unit length of the tubes.
|
|
Identify all the software you think the executive will need
: Identify all the software you think this executive will need and a non-academic source to purchase that software. Identify the hardware technical specifications the software needs to run with no significant delay.
|