A theory or explanation - Data can test what?, mean = sum of all values/number of values - How do you find the mean from repeated measurements?, 2+5+3+4 = 14/4 = 3.5 - what is the mean of these measurements: 2,5,3,4?, a measurement very different from the rest - What is an outlier?, An error in measurements or technique - What does an outlier show?, 2 - Which is the outlier? 8,9,7,2,8,, The result is insignificant, data does not support the theory - If there are no real differences between values what does that show?,

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