assigment 1 crib-S07

# assigment 1 crib-S07 - Assignment 1 Crib 6-2(c Accuracy...

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Assignment 1 Crib: 6-2 (c) Accuracy represents the agreement between a measured value and the true or accepted value. Precision describes the agreement among measurements made in exactly the same way. (d) Random errors result from uncontrolled variables in an experiment while systematic errors are those that can be ascribed to a particular cause and can usually be determined. 6-4 The standard error of a mean, s m , is the standard deviation of the set of data, s, divided by the square root of the number of data in the set, i.e. N s s m / = . The standard error of the mean is nearly always lower than the standard deviation of the data points in a set because N always has a value greater than 1. 6-7 data set A Listing the data from Set A in order of increasing value: x i x i 2 2.5 6.25 3.1 9.61 3.1 9.61 3.3 10.89 3.5 12.25

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Σ x i = 15.5 Σ x i 2 = 48.61 (a) mean: x = 15.5/5 = 3.1 (b) median = 3.1 (c) spread: w = 3.5 – 2.5 = 1.0 (d) standard deviation: () 37 . 0 1 5 5 / 5 . 15 61 . 48 2 = = s 0.4 (e) coefficient of variation: CV = (0.37/3.1) × 100% = 12% 6-9 (b) ( ) 089 . 0 08 . 0 0001 . 0 04 . 0
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assigment 1 crib-S07 - Assignment 1 Crib 6-2(c Accuracy...

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