Question: variable Z = (X1 - X2) - (141 -142) Voi/m +o; is then nearly the standard normal distribution. By using a quantile za/2 of the

variable Z = (X1 - X2) - (141 -142) Voi/m +o; is then nearly the standard normal distribution. By using a quantile za/2 of the standard normal distribution like be- fore and by noticing that inequalities - 20/2
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