Flashcards
EXAM 2
Flashcards do conjunto (30)
- 1standard errorthe average amount of difference between the sample statistic and the population parameter
- 2standard deviationthe avg distance between the mean and the data
- 3standard error of the mean (SEM)a measure of the dispursions of sample means around the population mean
- 4sampling distribution of meansfrequency distributions of all the sample means taken from a population
- 5central limit theoremtendency of sampling distribution of means to be normal even is samples are not
- 6properties of T distribution* used to determine probability of selecting a sample when population SD is unknown
*changes shape based on sample size - 7T tableappendix B, based of degrees of freedom
- 8degrees of freedomhow many values are free to vary after a stat has been calculated
- 9descriptive statscharacterize data (mean, median)
- 10inferential statisticsallow us to make decisions
- 11probabilitythe likelihood of an event occuring by chance due to random variability/ sampling error
- 12null hypothesisno difference in means
X=X - 13alternative hypothesismeans are not equal
X=/=x
x - 14alpha/ type 1 errorthe probability that we will reject the null hypothesis and be wrong
- 15effect sizea way of quantifying the difference between groups
- 16Cohens dthe number of SDs the two groups are apart
- 17confidence intervalsa numerical value use to indicate the likely range of the true population mean with a certain degree of confidence
- 18correlationan objective description of how two or more variables are linearly related
- 19scattergramplot of pairs of data on an XY axis
- 20correlation coefficiantshows magnitude/direction of relation
- 21pearson product coefficientused for two variables with at least interval data
- 22point biserialone variable is nominal and the other is at least interval
- 23spearman rho/ kendall tauboth variables are ordinal or rank
- 24one sample t testcompares sample to the population
- 25independent sample t testbetween subjects (compares two independent groups)
- 26paired sample t testwithin subjects, compares two data sets from same group
- 27ANOVAanalysis of variance, compares more than two groups
- 28types of anovabetween sub 1 factor
within subs 1 factor - 29f testanova's t test
- 30post HOC testused after the f value is acquired, compares groups within anova
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- Stats FlashCards sobre EXAM 2 , criado por Jordan Gidley em 13-11-2018.
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- Jordan Gidley
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