EXST 2201 Chapter : Stats Chapter 2 Notes

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15 Mar 2019
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The following data represent the flight time (in minutes) of a random sample of seven flights between the same two cities: Rank data in order: 257, 260, 260, 266, 267, 270, 282. Calculate the average of your data set by dividing the sum of all the numbers by the number of items in your data set. For example, if your data set is {6, 7, 8, 12, 16, 17}, the total is 66 and the average is 11. Calculate the difference between each number in the data set and the average. In this example, 6 minus 11 is -5, so the first number is -5. The other numbers are -4, -3, 1, 5, and 6. The other numbers squared are 16, 9, 1, 25 and 36. Add these squared numbers to calculate the sum of squares. In this example, add 25, 16, 9 , 1, 25 and 36 to find that the sum of squares equals 112.

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