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The following table contains the purchase price for 10 common drugs from three different internet sites.
Drug Site#1 Site#2 Site#3
A 235.54 269.99 121.02
B 157.99 190.99 55.30
C 166.00 190.99 93.45
D 174.99 200.99 137.70
E 108.60 129.99 22.48
F 186.66 203.99 161.93
G 107.99 106.99 64.53
H 117.39 134.99 59.83
I 115.99 126.99 57.75
J 181.10 200.99 58.79
(a) At 0.05 level of significance, determine if there is evidence of a difference in the mean prices of drugs at the three online sites?
(b) Use the Tukey procedure to determine which site prices differ? Use a 0.05 level of significance.
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Suppose Abraham Lincoln had answered a survey questionnaire in which he indicated that he had not received a grade school diploma.
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