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Statistical data analysis
process of collecting, organizing, summarizing, interpreting, and presenting data to answer research questions and support decision-making.
Why statistics in research
Describe Data
Test Hypothesis
Generalize to Population
Estimate effect size
Descriptive Statistics
Used to summarize and describe main features of data.
measures of central tendency
measures of dispersion
shape of distribution
Types of descriptive statistics
central tendency
dispersion
good idea to do a visual examination of distribution before measuring tendency and dispersion
Histogram
graph used to represent the frequency distribution of data measured on an interval or ratio scale (pg 138)
Normal distribution
normally distributed data has a bell curve
also is symmetrical
When to use bar chart
For nominal and ordinal variables
Central tendency
Central tendency refers to a value that represents the center or typical value of a dataset, commonly measured using the mean, median, or mode.
ex. graph on 138 most frequently occurring values are around score 100