At the beginning of the year, a stock market analyst produced a list of stocks to buy and another list of stocks to sell. For a random sample of 12 stocks from the buy list, percentage returns over the year were as follows:

2.8 4.7 1.2 3.2 4.8 1.4 2.1 3.0 1.7 3.3 3.1 3.4 For an independent random sample of 12 stocks from the sell list, percentage returns over the year were as follows:

9.2 7.0 5.0 5.4 3.6 10.0 5.2 7.4 9.8 4.4 8.2 2.2 Use the Mann-Whitney test to interpret these data at the 5% level.