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An experiment to compare the tension bond strength of polymer latex modified mortar (Portland cement mortar to which polymer

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Answer #1

a)

std error of difference σ1-2= √(σ21/n122/n2)    = 0.3398
test stat z                                       = (x1-x2o)/σ1-2     = 3.88
p value : = 0.0001
reject Ho, the data suggest that ...

b)

for 0.01 level and right tailed test critival value Za rejection region: >= 40 +Za*ox or type II error =probability of not re

c)

n=109

d)

Since n = 31 is not a large sample, it would no longer be appropriate to use the large sample test. A small sample t procedur

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