b) Assume that in a certain district the mean systolic blood pressure of persons aged 20 to 40  is 130 mm Hg with a standard deviation of 10 mm Hg. A random sample of 64 persons  aged 20 to 40 from village X of the same district has a mean systolic blood pressure of 132  mm Hg. Does the mean systolic blood pressure of the dwellers of the village (aged 20 to  40) differ from that of the inhabitants of the district (aged 20 to 40) in general, at the 5%  level of significance?

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