To study the effect of curing temperature on shear strength of acertain rubber compound, 80 specimens were cured at 150°C and 105were cured at 130°C. The specimens cured at 150°C had an averageshear strength of 620 psi, with a standard deviation of 20 psi.Those cured at 130°C had an average shear strength of 750 psi, witha standard deviation of 30 psi. Let μXμX represent the populationmean strength for the specimens cured at 130°C and let μYμYrepresent the population mean strength for the specimens cured at150°C. Find a 95% confidence interval for the difference μX−μYμX−μY. Round the answers to two decimal places.
