I need help with b

Suppose a guidebook gives a certain car a retail value of $18,000. The table below shows askingprices, indollars, for a sample of the same car model and year. At the 5% significancelevel, do the data provide sufficient evidence to conclude that the mean asking price of the car is less than the listed retailvalue?

16,533

16,178

16,094

15,978

15,751

15,669

14,550

13,427

15,660

15,601

A. Set up the hypotheses for the Wilcoxonsigned-rank test.

H0: = 18000 , Ha: < 18000

B. The test statistic is W =?