Does the male stock market investor earn significantly more than the female stock market investor? One study by the New York Stock Exchange showed that the male investor has an income of $46,400 and that the female investor has an income of $39,400. Suppose an analyst wanted to "prove" that the male investor earns more than the female investor. The following data represent random samples of male and female investors from across the United States. The analyst uses the Mann-Whitney U test to determine whether the male investor earns significantly more than the female investor for α = .01.What does the analyst find?

Male Female

$50,100 ........$41,200

47,800 ........36,600

45,000 ........44,500

51,500 ........47,800

55,000 ........42,500

53,850 ........47,500

51,500 ........40,500

63,900 ........28,900

57,800 ........48,000

61,100 ........42,300

51,000 ........40,000

31,400