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

variable Z = (X1 - X2) - (141 - 142) Voi/m +of 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 -Za/2 (X1 - X2) - (1 - H2)

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