Make a scatter plot of data Can you fit a straight line to raw data? If it appears nonlinear, linearize the data for assuming relation Calculate the mean life for a dynamic stress of 25 ksi. E
Make a scatter plot of data Can you fit a straight line to raw data? If it appears nonlinear, linearize the data for assuming relation Calculate the mean life for a dynamic stress of 25 ksi. E
MATLAB: An Introduction with Applications
6th Edition
ISBN:9781119256830
Author:Amos Gilat
Publisher:Amos Gilat
Chapter1: Starting With Matlab
Section: Chapter Questions
Problem 1P
Related questions
Question
- Fatigue Life tests yield the following data
|
Dynamic Stress (ksi)50 |
Fatigue Life (Cycles) |
|
50 |
3,500 |
|
40 |
6,000 |
|
30 |
28,000 |
|
20 |
100,000 |
|
15 |
300,000 |
|
12 |
800,000 |
- Make a
scatter plot of data - Can you fit a straight line to raw data? If it appears nonlinear, linearize the data for assuming relation
- Calculate the
mean life for a dynamic stress of 25 ksi. Estimate its confidence interval with 95 percent confidence level.
Expert Solution
Step 1
Let us denote X=dynamic stress and Y=Fatigue life.
Given information:
| x | Y |
| 50 | 3500 |
| 40 | 6000 |
| 30 | 28000 |
| 20 | 100000 |
| 15 | 300000 |
| 12 | 800000 |
1.
Excel Procedure:
- Enter the data for x and y in Excel sheet
- Select the columns of x and y.
- Go to Insert menu.
- Click on “Insert scatter or bubble chart” option.
- Select Scatter under Charts.
- Under chart elements, check Trend line as linear.
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