At a recent PGA tournament (the Honda Classic at Palm Beach Gardens, Florida) the following scores were posted for nine randomly selected golfers for two consecutive days. At? = 0.10, is there evidence of a difference in mean scores for the two days? Assume the variables are normally or approximately normally distributed and use? D for the mean on Thursday minus the mean on Friday.

Golfer 2 3 4 5 6 8 9 Thursday 65 68 68 70 68 70 69 68 66 Friday 70 69 71 70 72 69 70 75 67