Question

1- The data in file Prob1.csv contain results of tests of fuel consumption and various physical properties of the fuel. Investigate the extent of multicolinearity in the physical properties when used to predict consumption. (Note that you do not need to use vehicle in the model. Be sure to identify which variables might be collinear

2- Use all possible regressions to build two models of life expectancy from all the other variables in the data set Prob2.csv except Country with 1) Cp and 2) Adjusted Rsquared as the criteria. Choose the best model for each and compare the two models. Use the best=15 option to limit your output to the best 15 models.

3- An operations analyst in a multinational electronics firm studied factors affecting production in a piecework operation where earnings are based on the number of pieces produced. Two employees were selected from each of various age groups and the data on their productivity last year are contained in the file Prob3.csv with productivity in a coded scale. There is a more complicated relationship between productivity and age than might be expected because of changing life priorities as a person ages. In particular the investigators expected a third degree polynomial to provide a good fit. Run an analysis to check on their claim, being sure to focus on the correct degree of polynomial. Use the fitted model to find 95% confidence intervals for the mean productivity for 20, 40 and 60 year olds and a 95% prediction interval for a randomly selected 55 year old

4- The factors that influence the breaking strength of a synthetic fiber are being studied. Four production machines and 3 operators are chosen and each operator produces two specimens on each machine for testing. The data are in file Prob4.csv. Analyze the full model including an interaction term and check model assumptions with residual plots.

Solution Preview

This material may consist of step-by-step explanations on how to solve a problem or examples of proper writing, including the use of citations, references, bibliographies, and formatting. This material is made available for the sole purpose of studying and learning - misuse is strictly forbidden.

Statistics & Mathematics Questions

This is only a preview of the solution. Please use the purchase button to see the entire solution

Assisting Tutor

Related Homework Solutions

Lesson Plan for Mathematics Class
Homework Solution
$50.00
Mathematics
Algebra
Lesson Plan
Technology
Students
Creativity
Student Practice
Student Assessment
Real-world Problems
Writing
Classroom
Teaching
Mathematics Questions
Homework Solution
$25.00
Mathematics
Card Decks
Events
Probability
Tosses
Independence
Point Attempts
Binomial Distribution
Disk Drives
Math Problems
Homework Solution
$13.00
Mathematics
Covariance Matrix
Principal Components
Eigen Vectors
Distribution
Classes
Distance
Mean
Fibonacci (860 words)
Homework Solution
$30.00
Mathematics
Fibonacci
History
Numbers
Sequences
Golden Ratio
Triangles
Digits
Leonardo of Pisa
Liber Abaci
Summation
Power Series
Zeckendorf Theorem
House Payment Calculation
Homework Solution
$10.00
Mathematics
Income
Payment
Loan
House Payment
Front-End Ratio
Back-End Ratio
Income
Debt
Property Tax
Premium
Get help from a qualified tutor
Live Chats