Home / Questions / As concrete curesit gains strength The following data represent the 7-day and 28-day st...
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.
Data:
7-Day_Strength_(psi) x 28-Day_Strength_(psi) y
3330 4850
2620 4190
2300 4070
3380 5020
3390 5220
(A)Treating the 7-day strength as the explanatory variable, x, use technology to determine the estimates of β0 and β1.
(B) Compute the standard error of the estimate
(C) Determine
(E) Construct a 95% confidence interval about the slope of the true least-squares regression line. (Lower bound, Upper bound)
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