basic definitions statistics collect organize analyze summarize interpret information - data draw...
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Basic Definitions Statistics
Collect Organize Analyze Summarize Interpret Information - Data Draw conclusions
Basic Definitions Population - Sample
Population Sample Parameters µ σ ρ Statistics x s p
Basic Definitions Descriptive - Inferential
Descriptive– Graphs and charts– Numerical representations
– Central Tendency– Variability– Location
Inferential– Confidence Intervals– Hypothesis Testing
Basic Definitions Descriptive - Inferential
Descriptive
Probability
Inferential
Basic Definitions Variables - Measurement
Variables discrete – continuous Variable values Variables independent - dependent Scales
– Nominal– Ordinal– Interval– Ratio
Frequency Distribution Tables
Table with two entries:– Variable values– Number of occurrences of each value
Grouped frequency distribution tables Ungrouped frequency distribution tables Relative Frequencies Cumulative frequencies
Frequency Distribution Graphs
Horizontal line Variable values Vertical line Frequencies
Frequency Distribution Graphs
Bar Graph (discrete/nominal variables)
Histogram (continuous variables)
Frequency Polygon (middle points top of histograms)
Ogive (ptq)
Measures of Central Tendency
The Mean (arithmetic average) The Median (middle value) The Mode (most frequent value) Which one? Central Tendency and shape of
distribution
Measures of Variability
The Range The Population Variance and Standard
Deviation The Sample Variance and Standard
Deviation
Measures of Location
Z-scores and Location Percentiles Box Plots