Question

As concrete​ cures, it gains strength. The following data represent the​ 7-day and​ 28-day strength in pounds per square inch​ (psi) of a certain type of concrete

​7-Day Strength​ (psi), x
3340
3390
3380
2300
2480
 
​28-Day Strength​ (psi), y
4630
5220
5020
4070
4120
 
 
 
Construct a​ 95% confidence interval about the slope of the true​ least-squares regression line.
 
Lower​ bound:______.  ​(Round to three decimal places as​ needed.)
 
Upper​ bound:________.​(Round to three decimal places as​ needed.)

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Regression Analysis

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