Created by Daniel Walford
over 4 years ago


Question  Answer 
Σ  The sum of all numbers (Uppercase 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 (Lowercase Sigma) 
When do you divide by N in variance?  When you have a PoPuLaTiOn 
When do you divide by N1 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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