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Chapter 13
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Terms in this set (19)
Sample statistics
Variable in a sample or measures computed from sample data.
Frequency distribution
A set of data organized by summarizing the number of times a particular value of a variable occurs
Probability
the long-run relative frequency with which an event will occur
Proportion
The percentage of elements that meet some criterion
Mean
A measure of central tendency the arithmetic average.
Median
A measure of central tendency that is the midpoint; the value below which half the values in a distribution fall.
Mode
A measure of central tendency; the value that occurs most often.
Variance
A measure of variability or dispersion. Its square root is the standard deviation.
Standard deviation
A quantitative index of a distribution's spread, or variability; the square root of the variance for a distribution.
Normal distribution
A symmetrical bell-shaped distribution that describes the expected probability distribution of many chance occurrences.
Standardized normal distribution
A purely theoretical probability distribution that reflects a specific normal curve for the standardized value, z
Population distribution
A frequency distribution of the elements of a population
Sample distribution
A frequency distribution of a sample.
Sampling distribution
A theoretical probability distribution of sample means for all possible samples of a certain size drawn from a particular population.
Standard error
The standard deviation of the sampling distribution.
Central limit theorem
The theory that, as a sample size increases, the distribution of sample means of size n, randomly selected, approaches a normal distribution.
Point estimate
An estimate of the population mean in the form of a single value, usually the sample mean.
Confidence interval estimate
A specified range of numbers within which a population mean is expected to lie; an estimate of the population mean based on the knowledge that it will be equal to the sample mean plus or minus a small sampling error.
Confidence level
A percentage or decimal value that tells how confident a researcher can be about being correct; it states the long-run percentage of confidence intervals that will include the true population mean.
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