Golf: Tournaments Do professional golfers play better in their fi rst round?

Let row B represent the score in the fourth (and fi nal) round, and let row A represent the score in the fi rst round of a professional golf tournament. A random sample of fi nalists in the British Open gave the following data for their fi rst and last rounds in the tournament (Source: Golf Almanac):

B: Last 73 68 73 71 71 72 68 68 74 A: Last 66 70 64 71 65 71 71 71 71 Do the data indicate that the population mean score on the last round is higher than that on the fi rst? Use a 5% level of signifi cance.