a)
std error of difference σ1-2= | √(σ21/n1+σ22/n2) = | 0.3425 | |||
test stat z = | (x1-x2-Δo)/σ1-2 = | 3.80 | |||
p value : = | 0.0001 |
b)
type II error =0.2776
c)
n=109
An experiment to compare the tension bond strength of polymer latex modified mortar (Portland cement mortar...
An experiment to compare the tension bond strength of polymer latex modified mortar (Portland cement mortar to which polymer latex emulsions have been added during mixing) to that of unmodified mortar resulted in x = 18.11 kgf/cm2 for the modified mortar (m = 42) and y = 16.84 kgf/cm2 for the unmodified mortar (n = 30). Let uy and My be the true average tension bond strengths for the modified and unmodified mortars, respectively. Assume that the bond strength distributions...
An experiment to compare the tension bond strength of polymer latex modified mortar (Portland cement mortar to which polymer latex emulsions have been added during mixing) to that of unmodified mortar resulted in x = 18.19 kgf/cm2 for the modified mortar (m = 42) and y = 16.87 kgf/cm2 for the unmodified mortar (n = 31). Let Hy and uz be the true average tension bond strengths for the modified and unmodified mortars, respectively. Assume that the bond strength distributions...
1. An experiment to compare the tension bond strength of polymer latex modified mortar (Portland cement mortar to which polymer latex emulsions have been added during mixing) to that of unmodified mortar resulted in =18.12 kgf/cm2 for the modified mortar (m=40) and j = 16.87 kgf/cm2 for the unmodified mortar (n=32). Let Hy and My be the true average tension bond strengths for the modified and unmodified mortars, respectively. Assume that the bond strength distributions are both normal. a. Assuming...
An experiment to compare the tension bond strength of polymer latex modified mortar (Portland cement mortar to which polymer latex emulsions have been added during mixing) to that of unmodified mortar resulted in x = 18.12 kgf/cm2 for the modified mortar (m = 40) and y = 16.87 kgf/cm2 for the unmodified mortar (n = 32). Let ?1 and ?2 be the true average tension bond strengths for the modified and unmodified mortars, respectively. Assume that the bond strength distributions...
============================================== An experiment to compare the tension bond strength of polymer latex modified mortar (Portland cement mortar to which polymer latex emulsions have been added during mixing) to that of unmodified mortar resulted in 3 = 18.14 kgf/cm2 for the modified mortar (m = 42) and y = 16.34 kgf/cm2 for the unmodified mortar (n = 32). Let u, and uz be the true average tension bond strengths for the modified and unmodified mortars, respectively. Assume that the bond strength...
strength of polymer latex modified mortar (Portland cement mortar to which polymer latex emulsions have been added during miing) to that o unmodified mortar resulted in x 18.16 kgt/cm2 for the modified mortar (m 42) and y tension bond strengths for the modified and unmodified -16.87 kgf/cm2 for the unm dined mortar (n = 30). Let μ1 and», be the true average mortars, respectively. Assume that the bond strength distributions are both normal. (a) Assuming that σ1 1.6 and σ2-1.3,...
An experiment to compare the tension bond strength of polymer latex modified mortar (Portland cement mortar to which polymer latex emulsions have been added during mixing) to that of unmodified mortar resulted in x = 18.13 kgf/cm2 for the modified mortar (m = 42) and y = 16.83 kgf/cm2 for the unmodified mortar (n = 32). Let μ1 and μ2 be the true average tension bond strengths for the modified and unmodified mortars, respectively. Assume that the bond strength distributions...
| Previous AnswersDevoreStat9 9.E.006. Ask Your Teacher My Notes Question Part Points Submissions Used An experiment to compare the tension bond strength of polymer latex modified mortar (Portland cement mortar to which polymer latex emulsions have been added during mixing) to that of unmodified mortar resulted in x = 18.17 kgf/cm2 for the modified mortar (m = 42) and y = 16.85 kgf/cm2for the unmodified mortar (n = 32). Let μ1 and μ2 be the true average tension bond strengths...
An experiment was performed to compare the fracture toughness of high-purity 18 Ni maraging steel with commercial-purity steel of the same type. For m = 31 specimens, the sample average toughness was x = 65.3 for the high-purity steel, whereas for n = 38 specimens of commercial steel y = 59.5. Because the high-purity steel is more expensive, its use for a certain application can be justified only if its fracture toughness exceeds that of commercial-purity steel by more than...
The slant shear test is widely accepted for evaluating the bond of resinous repair materials to concrete; it utilizes cylinder specimens made of two identical halves bonded at 30°. An article reported that for 11 specimens prepared using wire-brushing, the sample mean shear strength (N/mm2) and sample standard deviation were 18.40 and 1.56, respectively, whereas for 11 hand-chiseled specimens, the corresponding values were 22.15 and 5.04. Does the true average strength appear to be different for the two methods of...