Regression Analysis: Normal Stress and Shear Resistance

There is a data inconsistency in the problem statement. The header row lists 9 pairs, but the intro table string lists 10 values for each variable. I will use the 9 clearly-tabulated pairs from the bracketed array: X (Normal stress) 26 25 28 23 27 23 24 28 26 :--:--:--:--:--:--:--:--:--:-- Y (She...