This topic contains a solution. Click here to go to the answer

Author Question: Civil engineers often use the straight-line equation, = 0 + 1x, to model the relationship between ... (Read 796 times)

newbem

  • Hero Member
  • *****
  • Posts: 579
Civil engineers often use the straight-line equation, = β0 + β1x, to model the relationship between the mean shear strength of masonry joints and precompression stress, x. To test this theory, a series of stress tests were performed on solid bricks arranged in triplets and joined with mortar. The precompression stress was varied for each triplet and the ultimate shear load just before failure (called the shear strength) was recorded. The stress results for n = 7 triplet tests is shown in the accompanying table followed by a SAS printout of the regression analysis.

Analysis of Variance
                      Sum of Mean
Source DF Squares Square F Value Prob > F

Model 1 2.39555 2.39555 47.732 0.0010
Error 5 0.25094 0.05019
C Total 6 2.64649

Root MSE 0.22403 R-square 0.9052
Dep Mean 2.32857 Adj R-sq 0.8862
C.V. 9.62073

Parameter Estimates

Parameter Standard      T for HO:
Variable DF Estimate Error Parameter=0 Prob > |T|

INTERCEP 1 1.191930 0.18503093 6.442 0.0013
 X 1 0.987157 0.14288331 6.909 0.0010

Give a practical interpretation of the estimate of the y-intercept of the least squares line.
◦ There is no practical interpretation since a triplet test with a precompression stress of 0 tons is outside the range of the sample data.
◦ For a triplet test with a precompression stress of 0 tons, we estimate the shear strength of the joint to increase 1.19 tons.
◦ For every 1 ton increase in precompression stress, we estimate the shear strength of the joint to increase by 0.987 ton.
◦ For a triplet test with a precompression stress of 0 tons, we estimate the shear strength of the joint to be 1.19 tons.


Related Topics

Need homework help now?

Ask unlimited questions for free

Ask a Question
Marked as best answer by newbem on Jan 16, 2020

elizabethrperez

  • Sr. Member
  • ****
  • Posts: 344
Lorsum iprem. Lorsus sur ipci. Lorsem sur iprem. Lorsum sur ipdi, lorsem sur ipci. Lorsum sur iprium, valum sur ipci et, vala sur ipci. Lorsem sur ipci, lorsa sur iprem. Valus sur ipdi. Lorsus sur iprium nunc, valem sur iprium. Valem sur ipdi. Lorsa sur iprium. Lorsum sur iprium. Valem sur ipdi. Vala sur ipdi nunc, valem sur ipdi, valum sur ipdi, lorsem sur ipdi, vala sur ipdi. Valem sur iprem nunc, lorsa sur iprium. Valum sur ipdi et, lorsus sur ipci. Valem sur iprem. Valem sur ipci. Lorsa sur iprium. Lorsem sur ipci, valus sur iprem. Lorsem sur iprem nunc, valus sur iprium.
Answer Preview
Only 35% of students answer this correctly






 

Did you know?

Oliver Wendell Holmes is credited with introducing the words "anesthesia" and "anesthetic" into the English language in 1846.

Did you know?

On average, someone in the United States has a stroke about every 40 seconds. This is about 795,000 people per year.

Did you know?

It is difficult to obtain enough calcium without consuming milk or other dairy foods.

Did you know?

The first successful kidney transplant was performed in 1954 and occurred in Boston. A kidney from an identical twin was transplanted into his dying brother's body and was not rejected because it did not appear foreign to his body.

Did you know?

The first documented use of surgical anesthesia in the United States was in Connecticut in 1844.

For a complete list of videos, visit our video library