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 (psi × 106) when two different polymers were used to repair cracks in failed concrete.

Obtain a 90% CI for the ratio of variances by first using the method suggested in the text to obtain a general confidence interval formula.

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Epoxy MMA prepolymer 1.77 9 .70 1.69 1.75 2.12 2.05 1.97