Independent random samples..Stats please help?

The Store supplied following data on customer ages from independent random samples





Store 1


n1=36


xbar1 = 40 yrs


s1=9 yrs





Store 2


n2=49


xbar2= 35 yrs


s2=10 yrs





For a .05 level significance test the null hypothesis. Ho: [mu1-mu2=0] against the alternative hypothesis Ha[mu1-mu2 not =0]. What is you conclusion about the mean ages of the populations?





a. test statistic = -2.41/ critical value = -1.96 so reject null hyp


b. test statistic = 7.04/ critical value = 1.645 so reject null hyp


c. test statistic = 2.41/ critical value = 1.96 so reject null hyp


d. test statistic = -7.04/ critical value = -1.96 so reject null hyp

Independent random samples..Stats please help?
Is the same of this:





http://mx.answers.yahoo.com/question/ind...