8.21 The number of pairs of shoes owned by adult women is assumed to follow a skewed distribution. A random sample of 10 women was taken and each woman was asked how many pairs of shoes she owned. Their responses were:

7 24 15 7 18 15 9 13 8 10 Using this data test the hypothesis that the median number of pairs of shoes owned by adult women is 12.

Apply the sign test with a 5 per cent level of significance.