Choosing a statistical What are you trying to do?.

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To Select a Descriptive Statistic

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Presentation transcript:

Choosing a statistical What are you trying to do?

Describe a sample or population Measures of Central Tendency Mean, Median, Mode Measures of Dispersion Range, standard deviation

Infer about a population from a sample What level of data ? Interval Ordinal Nominal Chi Square Goodness of fit Nonparametric tests Infer about a population from a sample What level of data ? Interval Ordinal Nominal

Interval Ordinal Nominal Chi Square Goodness of fit

Interval Ordinal Nominal Nonparametric tests Mann Whitney U ( 2 samples) Kruskal Wallace H Test (3 or more samples)

Interval Ordinal Nominal Relationship or Difference ?

Relationship or Difference? Pearson r correlation 2 dependent variables

Relationship or Difference How many variables?

How many variables? One Variable Two Variables

One Variable or Two Variables 2 way ANOVA

One Variable or Two Variables How many groups?

One group Two groups More than two Groups

One group Two groups More than two Groups t test for single  is known  is unknown

One group Two groups More than two Groups t test for 2 samples independent samples or matched samples

One group Two groups More than two Groups One way ANOVA 3 or more levels of the ind. Var.