A charity launched a campaign to raise awareness of low pay amongst full-time workers in company canteens. The charity now believes the median weekly wage in this job sector has increased.

After the campaign, a random sample of ten canteen workers was asked how much they earned in the previous week. The results. in NZ$, were as follows. 

Before the campaign the median weekly wage for full-time workers in the company canteens was NZ$ 147.50.

Carry out a Wilcoxon signed-rank test to determine whether there has been an increase in the median wage after the campaign. Use the 5% level of significance.

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156.45 145.50 151.30 150.70 156.10 151.15 144.40 146.60 163.75 157.60