Question 5 The article Enhancement of Compressive Properties

Last updated: 12/14/2023

Question 5 The article Enhancement of Compressive Properties of Failed Concrete Cylinders with Polymer Impregnation J of Testing and Evaluation 1977 333 337 reports the following data on impregnated compressive modulus psix 106 when two different polymers were used to repair cracks in failed concrete Epoxy 1 01 MMA prepolymer 2 02 1 75 2 12 2 05 1 77 1 59 1 70 1 97 1 69 Part a 5 points Construct a 95 CI for the standard deviation 02 of impregnated compressive modulus when using MMA prepolymer Part b 5 points Does the data suggest that the variance of Epoxy differs from that of MMA prepolymer at significant level 0 05 hint Ho 0 0