Random Errors Suppose that I make N measurements of a certain quantity x and my measurement errors are random. Then I would report my final answer as as:

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Presentation transcript:

Random Errors Suppose that I make N measurements of a certain quantity x and my measurement errors are random. Then I would report my final answer as as: Where: As an example, suppose we measured the period of a pendulum over 5 cycles for a given length and we made 5 such measurements. Below I show the average and standard deviation for the measurement of the period : averagestandard deviation

Using Excel So I would report my measurement of the period for this specific length as 2.07 ± 0.02 s. You can use Excel to find the mean (average) and standard deviation for numbers in a row (say B2 to B6). The functions are: AVERAGE(B2:B6) STDEV(B2:B6)

Random Errors and Gaussian Distributions Suppose a given set of measurements is indeed random and the set is characterized by a certain average or mean: and a certain standard deviation:. We assume that the distribution of measurements for x will follow a Gaussian distribution given by: The constant in front of the exponential guarantees that the integral of f(x) from minus to plus infinity is 1; that is - the probability of getting some value is 100%. This function allows us to estimate the probability that another measurement of x will deviate from the meanby some specified amount.

Gaussian Distribution The integral under the Gaussian distribution from ( ) to ( ) is the probability that another measurement will fall within 1 of the mean. According to the table below that is ( )% = 68.3%. Similarly, the probability that a measurement is within 2 of the mean is 95%.