Question 479428
a) 
Ho: mean[A]>mean[B]
H1: mean[A]=mean[B]
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b)
{{{sigma=sqrt((1.25^2/55)+(1.82^2/58))=.292}}}
z=(4.64-4.03)/.292=2.09
2.09 is greater than the acceptance region 1.28 which is z for a one tailed test with alpha of 0.10
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c)
Ho is accepted:  mean[A]>mean[B]
P value of 2.09 is 0.018 which is the probability that Ho is false.
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Ed