In a study of 1006 men in four occupations, a multiple regression was carried out to show how lung function was related to age, smoking and...
View the step-by-step solution to:

Question

图像 2019-10-14,上午1.42.jpg

What is the mean air

capacity of a 20 year old farmworker who smokes 10 cigarettes per day?

What is the estimated difference in air capacity between two farmers of the same age, one of whom smokes 10 cigarettes per day, and the other of whom does not smoke?

Construct a 95% confidence interval for β5. [Note: In R you can get the upper 2.5'th percentile of the t distribution with m degrees of freedom, as qt(.975,m). 

Use the Bonferroni procedure to construct simultaneous 95% confidence intervals for β5 and β0.

Construct a 95% confidence interval for the mean of Y , for a 30 year old chemical worker who does not smoke.

Construct a 95% prediction interval for the mean of Y , for a 30 year old chemical worker who does not smoke.

Construct a 95% confidence interval for β0 + β5.

图像 2019-10-14,上午1.42.jpg

1. In a study of 1006 men in four occupations, a multiple regression was carried
out to show how lung function was related to age, smoking and occupation.
The four occupations represented in the study were physician, firefighter, farm
worker, and chemical worker. The variables in the regression were:
Y air capacity (ml) that the worker can expire in one second
X1 age in years
X2 number of cigarettes smoked per day
X3 1 if chemical worker, 0 otherwise
X4 1 if farm worker, 0 otherwise
X5 1 if firefighter, 0 otherwise
The model Y = Bo + BIX1 + B2X2 + 83X3 + BAX4 + 35X's + e was fit to the
data with the following result:
Y = 4500 - 39X1 - 9X2 - 350X3 - 380X4 - 180X5
It was found that MSE = 9 and
9
8
7
8
3 5 6
1 17
HOTOA
6
1
(X'X)-1 =
5
6
1 6
8
3
7
5
8
8
7
3
5
4

Recently Asked Questions

Why Join Course Hero?

Course Hero has all the homework and study help you need to succeed! We’ve got course-specific notes, study guides, and practice tests along with expert tutors.

  • -

    Study Documents

    Find the best study resources around, tagged to your specific courses. Share your own to gain free Course Hero access.

    Browse Documents
  • -

    Question & Answers

    Get one-on-one homework help from our expert tutors—available online 24/7. Ask your own questions or browse existing Q&A threads. Satisfaction guaranteed!

    Ask a Question
Ask Expert Tutors You can ask You can ask ( soon) You can ask (will expire )
Answers in as fast as 15 minutes