*Note: though the symbols below are commonly used, representations may vary. Please consult your text or other class materials for guidance.
| Description | Symbol | |
| Summation (this symbol is telling you to add) | Ξ£ (βsigma,β capitalized) | |
| Null hypothesis | π»0 | |
| Alternative hypothesis | π»π or π»1 | |
| Significance Level | πΌ (βalphaβ) | |
| Z critical value | ππΌ or ππΌ/2 | |
| T critical value | π‘πΌ or π‘πΌ/2 | |
| Chi-squared | π2 | |
| Coefficient of determination | π 2 | |
| Less than | < | |
| Less than or equal to | β€ | |
| Greater than | > | |
| Greater than or equal to | β₯ | |
| Not equal to | β | |
| Approximately equals | β | |
| Predicted y value | π¦Μ (βy-hatβ) | |
| Slope of a linear equation | π | |
| y-intercept of a linear equation | π | |
| Slope of a prediction equation | π½1 (βbeta 1β) | |
| y-intercept of a prediction equation | π½0 (βbeta 0β) | |
| Quartile 1 | Q1 | |
| Quartile 3 | Q3 | |
| Sample Statistic | Population Parameter | |
| Median | π or Med | None |
| Size (the number of members in your sample or population) | π | π |
| Mean (AKA average) | π₯Μ (βx-barβ) | π (βmuβ) |
| Standard deviation (SD or s.d.) | π | π (βsigmaβ) |
| Proportion | πΜ (βp-hatβ) | π |
| Correlation coefficient | π | π (βrhoβ) |
Probability Symbols
| Sample space | π |
| Event | πΈ (often written as πΉ as well) |
| Probability of event E | π(πΈ) |
| Union | βͺ |
| Intersection | β© |
| Empty Set | β |
| Complement | πΈβ² or πΈπΆ |
| Conditional Probability | π(πΈ|πΉ)(βProbability of event E given event Fβ) |
| Factorial | ! |
| Combination | ππΆπ |
| Permutation | πππ |
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