According to Colliers International, the median monthly parking rate in the United States for 2012 was \(\$ 164.80\). The data in Table 7 represent a random sample of monthly parking rates in Milwaukee, Wisconsin.

Using the Wilcoxon signed-ranks test at the \(\alpha=0.05\) level of significance, do the data indicate that the median monthly parking rate in Milwaukee is below normal? Note that a normal probability plot indicates that the data are not normally distributed.

Approach As indicated, we use the Wilcoxon signed-ranks test. Because this is not a matched-pairs sample, we obtain the required differences by subtracting the median stated in the null hypothesis from each observation.

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Table 7 $79.01 $81.58 $107.60 $167.38 $134.22 $92.79 $39.65 $147.18 $68.76 $126.22 $187.56 $178.34 $95.47