# Shared Flashcard Set

## Details

j382 stats
j382 stats
23
Journalism
11/27/2007

Term
 descriptive stats
Definition
 helps describe data by reducint it for easier interpretationa-12, b-9, c-18
Term
 data distribution
Definition
 a collection of numbers6,8,10
Term
 frequency distributions
Definition
 group intervals, percentage, and cumulative frequency 0-10, 11-20
Term
 summary stats
Definition
 helps make data more manageable
Term
 central tendency
Definition
 what is a typical score?-uses one number to characterize distribution
Term
 dispersion (variance)
Definition
 describes how data or scores are dispersed across a distribution
Term
 3 dispersion measures
Definition
 range, variance, standard deviation
Term
 range
Definition
 difference between maximum vallue and minimum value in a distribution
Term
 variance
Definition
 statistical average of the amount of dispersion in a distribution of scores...how they vary from the mean
Term
 standard deviation
Definition
 difference between an individual score and the mean of a score of a distribution
Term
 normal distribution (bell curve)
Definition
 normalcy
Term
 standardization and z-scores
Definition
 -converts raw scores into standard deviation units-how far above or below the mean a score is in sdu-allows for comparisons of apples and oranges
Term
 null hypothesis
Definition
 no significan difference
Term
 standard error
Definition
 always there because of how samples are drawn, generally 5%...confidence level
Term
 central limit theorem
Definition
 as long as you have a large enough sample, sampling distribution of the mean will be normally distributed-more than 30 samples are needed
Term
 t-test
Definition
 comparing two groups' mean scores
Term
 ANOVA
Definition
 extension of the t-test and used to investigate several independent variables simultaneously
Term
 correlations
Definition
 measures how two variables change in relationship to another
Term
 regression analysis
Definition
 uses association between two variables to make predictions-_____to the normal curve
Term
 statistical methods
Definition
 parametric and nonparametric
Term
 chi-square (x^2) test
Definition
 value that compares observed with expected frequencies-if the value equals or exceeds value on table, then statistically significant-use on content analysis, observation, experiment
Term
 cross-tabulation
Definition
 same as x2 but two or more variables are tested at the same time
Term
 z-scores
Definition
 -compare scores from diff. methods-one of the most used stats
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