I An example Problem 14.8: According to the director of a county tourist bureau, there is a median of 10 hours of sunshine per day during the summer months. For a random sample of 20 days during the past three summers, the number of hours of sunshine has been recorded below. use the 0.05 level in evaluating the director s claim 89810977 97798119 107811812 C 2002 The Wadsworth Group
An Example • Problem 14.8: According to the director of a county tourist bureau, there is a median of 10 hours of sunshine per day during the summer months. For a random sample of 20 days during the past three summers, the number of hours of sunshine has been recorded below. Use the 0.05 level in evaluating the director’s claim. 8 9 8 10 9 7 7 9 7 7 9 8 11 9 10 7 8 11 8 12 © 2002 The Wadsworth Group
团 An example, continued hrs d d, hrs d d There are 8-22 7 with rank 1 8 1,23,45,6,7 8-22 11+11 average rank= 4 1000 6 with rank 2 9-11 1000 8,9,10,11,12,13 7-33 7-33 average rank= 10.5 7-33 5 with rank 3 14,15,16,1718 7-33 8-22 average rank =16 7-33 2+22 C 2002 The Wadsworth Group
An Example, continued hrs. di|di| hrs. di|di| 8 –2 2 9 –1 1 9 –1 1 8 –2 2 8 –2 2 11 +1 1 10 0 0 9 –1 1 9 –1 1 10 0 0 7 –3 3 7 –3 3 7 –3 3 8 –2 2 9 –1 1 11 +1 1 7 –3 3 8 –2 2 7 –3 3 12 +2 2 There are: 7 with rank 1 1, 2, 3, 4, 5, 6, 7 average rank = 4 6 with rank 2 8, 9, 10, 11, 12, 13 average rank = 10.5 5 with rank 3 14, 15, 16, 17, 18 average rank = 16 © 2002 The Wadsworth Group