Created by Daniel Walford
about 5 years ago
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Question | Answer |
Σ | The sum of all numbers (Upper-case Sigma) |
What graph, and symmetry, can be used to test if the mean is appropriate? | A histogram |
What is the mode? | The most frequent number |
What averages are measures of Central Tendency? | The Mean, Median, and Mode are all measures of central tendency |
What are measures of variability? | Measures of variability include: The Range, IQ Range, Variance, Standard Deviation |
What is the IQ Range? | The Range of the middle 50% scores |
What is the Variance? | The average of each score's squared deviation from the mean |
σ | Variance (Lower-case Sigma) |
When do you divide by N in variance? | When you have a PoPuLaTiOn |
When do you divide by N-1 in variance? | When you want to generalise a sample. REMEMBER, N(Population) -1 is the sample, because the sample is less than the Population! |
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