The observations come from a distribution with mean

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Let the ordered sample observations be denoted by  being the smallest and yn the largest). Our suggested check for normality is to plot the  pairs. Suppose we believe that the observations come from a distribution with mean 0, and let  w1,..., wn be the ordered absolute values of the xi 9s. A half­normal plot is a probability plot of the wi 9s. More specifically, since  half-normal plot is a plot of the  airs. The virtue of this plot is that small or large outliers in the original sample will now appear only at the upper end of the plot rather than at both ends. Construct a half-normal plot for the following sample of measurement errors, and comment 

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