# Shared Flashcard Set

## Details

BIO 150L #1 Review_Sci. Method
Terms and equations
13
Biology
01/21/2009

Term
 Statistic
Definition
 *Individual observations*Subset of population*Selected so that population is accurately represented*Selected randomly*Purpose: inferences re. populationAn estimation of a population parameter, determined by random sampling of that population
Term
 Sample
Definition
 A collection of individual observations by a specific procedure and criteria to represent the population being sampled. A subset of the population, selected by random sampling, that is usually used to make inferences about the population in general.
Term
 Parameter
Definition
 A quantity or absolute measure of a central tendency to describe and define a characteristic of a populationBasically: a quantity which describes a population (not a sample)
Term
 Variable
Definition
 a property of an individual or object that can assume two or more values, or one that varies in magnitude or amount.Basically: an attribute of a system that can change (so better make sure it doesn't change when you're doing your experiment!)
Term
 Variate
Definition
 a single score, reading, or observation of a variable. Symbolized by y1, y2, y3, y4, etc.Basically: various individual values of a variable represented by y1, y2, etc.
Term
 Accuracy
Definition
 The nearness of a measurement to the actual value of the variable being measuredBasically: correctness; how close to the bull's eye you got
Term
 Precision
Definition
 closeness of repeated measurements of the same quantity. "Repeatability"Basically: how close to each other your measurements were (regardless of how close to the bull's eye they were).
Term
 Frequency
Definition
 how often a particular value of a variable occurs within the sampleBasically: say you're measuring heights of men. they are 5'5, 5'8, 6'0, 6'0, 6'0, and 5'll. The FREQUENCY of 6'0 is 3.
Term
 Mean
Definition
 the sum of all variates divided by the total number of variates in the sample
Term
 Variance
Definition
 the sum of the square of the differences between each variate and the sample mean, divided by the sample size minus 1
Term
 Standard Deviation (s)
Definition
 the square root of the variance
Term
 Standard Error of the Mean (SEM)
Definition
 the standard deviation divided by the square root of the sample size
Term
 Range
Definition
 A measure of dispersion of a distribution around the mean; the distance between the lowest and highest data points
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