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   28-Day_Strength_(psi)_-_y
3390   5220
3340   4630
2300   4070
2480   4120
3380   5020

​(a) Treating the​ 7-day strength as the explanatory​ variable, x, use technology to determine the estimates of β0 and β1.

β0≈b0=1981.5

​(Round to one decimal place as​ needed.)

β1≈b1=0.8833

​(Round to four decimal places as​ needed.)

b) Compute the standard error of the​ estimate, se.

se=__?__

​(Round to one decimal place as​ needed.)

Answer 1

standard error of the​ estimate =230.5