{[ promptMessage ]}

Bookmark it

{[ promptMessage ]}

Descriptive statistics

Descriptive statistics - Test Hypotheses that do not...

This preview shows page 1. Sign up to view the full content.

Descriptive statistics - Central Tendencies o Mean: arithmetic average o Median: middle number o Mode: most frequent score - Variance: deviation from the mean o Range: variability in a data set o Standard Deviation: Square root of Variance - Inferential statistics o Determine whether relationships or differences we observe actually oceur in the population o Whether the differences we observed occurred by chance - There are 2 types of inferential statistics: o Parametric statistics Allow us to estimate parameters (eg. Means and standard deviations) Used with interval or ratio data REQUIRES NORMALITY Requires homoschedasticity There o Non parametric statistics
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: Test Hypotheses that do not involve parameters Data are nominal or ordinal Data are not normally distributed • Spearman rank correlation, chi-square-What does statistical significance mean? o There is only a small probability that what we found was due to chance alone o That small “chance” probability goes by various names: Type 1 error Alpha level (pre determined by investigator Symbolized by an italicized p (observed)-In Psychology alpha is usually 5% or .05 o If our results cannot be obtained by chance more than 5 times in 100 random trials our results are statistically significant...
View Full Document

{[ snackBarMessage ]}

Ask a homework question - tutors are online