Correlation - Relationship measure between variables, Co-variable - One of two related variables, Positive correlation - Both variables increase together, Negative correlation - One increases, other decreases, Zero correlation - No relationship between variables, Qualitative data - Describes qualities, non-numerical, Quantitative data - Numerical, measurable data, Primary data - Collected firsthand by researcher, Secondary data - Previously collected, reused data, Meta-analysis - Combines results of multiple studies, Median - Middle value ordered, Mode - Most frequent value, Range - Difference between highest and lowest, Standard deviation - Variance from the mean, Scattergram - Dots showing relationships, Bar chart - Bars for categorical discrete data, Histogram - Graph showing frequency within intervals, Normal distribution - A distribution that is symmetrical and bell-shaped, Skewed distribution - A distribution that is not symmetrical, Mean - The average value., Positive skew - Tail is longer on the right; most values are low., Negative Skew - Tail is longer on the left; most values are high.,

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