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# Ch4_2 - 1 Section 4.2 Elementary Statistics Elementary...

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Next Previous Section 4.2: Elementary Statistics 11 ® Elementary Statistics ® Sample Distributions ® Mean ® Median ® Standard Deviation ® Sample size effects Section 4.2: Elementary Statistics

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Next Previous Section 4.2: Elementary Statistics 22 ® Usually, only a sample of a population is measured ® The results are then taken to represent the entire population ® Example: Determine the amount of lumber in a wooded area ® Method: ® Measure a few trees in a sample area to obtain an approximate average diameter and height ® Count the number of trees in sample area ® Use results to estimate the total wood in the sample area ® Extrapolate results to entire forest The usefulness of statistics
Next Previous Section 4.2: Elementary Statistics 33 ® Magnitude: Size of a variable ® Observation: Result of a single measurement ® Parent Population: Collection of all possible measurements ® Sample: A finite group of measurements ® Error: Deviation from the true value ® Accuracy: Closeness to the true value ® Precision: Closeness of a grouping to each other ® Precision k Accuracy ® Maybe you can measure precisely to D 0.1 mm ® But you could be quite wrong if ruler is 25 mm too short Some useful statistical terms

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Next Previous Section 4.2: Elementary Statistics 44 Histogram: Frequency of occurrence vs. Value Example: Grades on a quiz grade # of grades value 4 2 5 4 6 7 7 8 8 6 9 3 10 2 32 total grades Frequency Value The distribution of values grade values # of grades
Next Previous Section 4.2: Elementary Statistics 55 Value Frequency

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Ch4_2 - 1 Section 4.2 Elementary Statistics Elementary...

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