This is Dataplot data file MICHELSO.DAT Michelson's 1879 Determination of the Speed of Light in Air (with thanks to Churchill Eisenhart for providing the data). Number of observations = 100 Number of variables = 5 Order of variables on a line image-- 1. Response = Speed of light (in millions of meters per second) 2. Factor 1 = Air temperature in degrees F 3. Factor 2 = Elapsed days (day 1 = June 5, 1879) 4. Factor 3 = Coded morning/afternoon (1 = am, 2 = pm) 5. Factor 4 = Data set (1 to 24) Source--Dorsey, Ernest N. (1944). The Velocity of Light. Transactions of the American Philosophical Society, Volume 34, Part 1, pages 1-110. Table 22. Note--Speed of light in a vacuum is (as of 1963)-- = 299792.5 kilometers/sec = 299.7925 millions of meters per second To read this file into Dataplot (& analyze)-- skip 25; read michelso.dat y temp day ampm set characters box plot lines box plot box plot y set Speed of Light Temp Day Ampm Set ------------------------------------------ 299.85 76 1 2 1 299.74 72 3 2 2 299.90 72 3 2 2 300.07 72 3 2 2 299.93 72 3 2 2 299.85 72 3 2 2 299.95 83 5 2 3 299.98 83 5 2 3 299.98 83 5 2 3 299.88 83 5 2 3 300.00 83 5 2 3 299.98 90 6 2 4 299.93 90 6 2 4 299.65 71 8 1 5 299.76 71 8 1 5 299.81 71 8 1 5 300.00 72 9 1 6 300.00 72 9 1 6 299.96 72 9 1 6 299.96 79 9 2 7 299.96 79 9 2 7 299.94 79 9 2 7 299.96 79 9 2 7 299.94 79 9 2 7 299.88 79 9 2 7 299.80 79 9 2 7 299.85 64 10 1 8 299.88 64 10 1 8 299.90 65 10 1 8 299.84 66 10 1 8 299.83 67 10 1 8 299.79 84 10 2 9 299.81 85 10 2 9 299.88 84 10 2 9 299.88 84 10 2 9 299.83 84 10 2 9 299.80 62 13 1 10 299.79 63 13 1 10 299.76 64 13 1 10 299.80 77 13 2 11 299.88 77 13 2 11 299.88 77 13 2 11 299.88 77 13 2 11 299.86 77 13 2 11 299.72 58 14 1 12 299.72 58 14 1 12 299.62 59 14 1 12 299.86 75 14 2 13 299.97 75 14 2 13 299.95 75 14 2 13 299.88 60 16 1 14 299.91 61 16 1 14 299.85 62 16 1 14 299.87 63 16 1 14 299.84 78 16 2 15 299.84 79 16 2 15 299.85 80 16 2 15 299.84 79 16 2 15 299.84 79 16 2 15 299.84 79 16 2 15 299.89 61 17 1 16 299.81 62 17 1 16 299.81 63 17 1 16 299.82 64 17 1 16 299.80 65 17 1 16 299.77 80 17 2 17 299.76 81 17 2 17 299.74 82 17 2 17 299.75 82 17 2 17 299.76 81 17 2 17 299.91 89 19 2 18 299.92 89 19 2 18 299.89 90 19 2 18 299.86 90 19 2 18 299.88 90 19 2 18 299.72 72 20 1 19 299.84 73 20 1 19 299.85 74 20 1 19 299.85 75 20 1 19 299.78 76 20 1 19 299.89 86 22 2 20 299.84 86 22 2 20 299.78 73 23 1 21 299.81 74 23 1 21 299.76 75 23 1 21 299.81 75 23 1 21 299.79 76 23 1 21 299.81 76 23 1 21 299.82 85 26 2 22 299.85 86 26 2 22 299.87 86 26 2 22 299.87 86 26 2 22 299.81 83 27 2 23 299.74 84 27 2 23 299.81 86 27 2 23 299.94 86 27 2 23 299.95 86 28 2 24 299.80 86 28 2 24 299.81 86 28 2 24 299.87 85 28 2 24