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Good forecasting and control of preconstruction activities

Statistics for Engineers and Scientists | 4th Edition | ISBN: 9780073401331 | Authors: William Navidi ISBN: 9780073401331 38

Solution for problem 5E Chapter 7.4

Statistics for Engineers and Scientists | 4th Edition

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Statistics for Engineers and Scientists | 4th Edition | ISBN: 9780073401331 | Authors: William Navidi

Statistics for Engineers and Scientists | 4th Edition

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Problem 5E

Good forecasting and control of preconstruction activities leads to more efficient use of time and resources in highway construction projects. Data on construction costs (in $ 1000s) and person-hours of labor required on several projects are presented in the following table and are taken from the article “Forecasting Engineering Manpower Requirements for Highway Preconstruction Activities” (K. Persad, J. O’Connor, and K. Varghese, Journal of Management Engineering, 1995:41-47). Each value represents an average of several projects, and two outliers have been deleted.

Person-

Hours (X)

Cost(Y)

Person-

Hours (X)

Cost(Y)

939

251

1069

355

5796

4690

6945

5253

289

124

4159

1177

283

294

1266

802

138

138

1481

945

2698

1385

4716

2327

663

345

 

 

a. Compute the least-squares line for predicting y from x.

b. Plot the residuals versus the fitted values. Does the model seem appropriate?

c. Compute the least-squares line for predicting ln y from ln x.

d. Plot the residuals versus the fitted values. Does the model seem appropriate?

e. Using the more appropriate model, construct a 95% prediction interval for the cost of a project that requires 1000 person-hours of labor.

Step-by-Step Solution:
Step 1 of 3

Chapter 9: Multivariate Designs - Means many variables - Study more than 2 variables in a single study - Enhance understanding of bivariate associations Longitudinal design - Measures same variables and same sample at several time points - Use to assess variable relationships across time - Use to see variable stability across time - 3 types of correlations assessed o Cross sectional: two variables measured at the same point in time [bivariate correlations] o Autocorrelations; testing variable against itself measured at two time points. o Cross-lag correlations; early measure of one variable against later measure of the other variable Moderation Language - Violence

Step 2 of 3

Chapter 7.4, Problem 5E is Solved
Step 3 of 3

Textbook: Statistics for Engineers and Scientists
Edition: 4
Author: William Navidi
ISBN: 9780073401331

This full solution covers the following key subjects: preconstruction, model, appropriate, Projects, activities. This expansive textbook survival guide covers 153 chapters, and 2440 solutions. The full step-by-step solution to problem: 5E from chapter: 7.4 was answered by , our top Statistics solution expert on 06/28/17, 11:15AM. Statistics for Engineers and Scientists was written by and is associated to the ISBN: 9780073401331. This textbook survival guide was created for the textbook: Statistics for Engineers and Scientists , edition: 4. Since the solution to 5E from 7.4 chapter was answered, more than 276 students have viewed the full step-by-step answer. The answer to “Good forecasting and control of preconstruction activities leads to more efficient use of time and resources in highway construction projects. Data on construction costs (in $ 1000s) and person-hours of labor required on several projects are presented in the following table and are taken from the article “Forecasting Engineering Manpower Requirements for Highway Preconstruction Activities” (K. Persad, J. O’Connor, and K. Varghese, Journal of Management Engineering, 1995:41-47). Each value represents an average of several projects, and two outliers have been deleted.Person-Hours (X)Cost(Y)Person-Hours (X)Cost(Y)9392511069355579646906945525328912441591177283294126680213813814819452698138547162327663345 a. Compute the least-squares line for predicting y from x.________________b. Plot the residuals versus the fitted values. Does the model seem appropriate?________________c. Compute the least-squares line for predicting ln y from ln x.________________d. Plot the residuals versus the fitted values. Does the model seem appropriate?________________e. Using the more appropriate model, construct a 95% prediction interval for the cost of a project that requires 1000 person-hours of labor.” is broken down into a number of easy to follow steps, and 150 words.

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