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The art/science of collecting, interpreting, and analyzing data (after designing and experimenting) |
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A group of objects with common identifying characteristics; membership must be clearly defined |
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A property of a sample (X-bar) |
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Characteristic or property of a population |
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Random Sampling Variation |
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The uncertainty surrounding estimates of parameters (standard error of the mean) |
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As sample size is increased, the accuracy of the statistic increases |
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The shape of the sampling distribution becomes normally distributed as sample size increases regardless of the shape of the population distribtuion |
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'peakedness' of the curve or fourth moment around the mean of a population distribution |
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Classified by quality not quantity (example: hair color, zodiac sign) |
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Constant interval and a true zero point (example: weights, volumes) |
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Constant interval, zero point is arbitrary (example: C or F temps) |
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Not equal units apart (example: places in a race) |
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Software that translate a program from high level language to machine language and back again |
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each and every member of the population has an equal and independent chance of being chosen (each and every random set of data from a population has an equal and independent chance) |
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Data stored as strength of current |
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Data stored as 1 or 0 (binary or machine language) |
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Closeness of repeated measurements of the same object |
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Pattern to the errors (always over or under estimate) |
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Variables that are not studied in an experiment yet can affect the response variables |
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A frequency distribution of some random variable (i.e. X) for a population |
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A theoretical frequency distribution of some statistic (i.e. X-bar) for many samples of a given sample size from a population |
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A frequency distribution of some random variable (i.e. X) for a sample |
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A population is broken into strata based on some variable and the sampling intensities are varied by the strata |
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Center of Gravity for a Population Distribution |
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Center of Gravity for Sample Distribution |
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Systematic choice (every 5th person, every 100 feet) |
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