Point at or below which 50% of scores fall, if arranged in numerical order
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What is the mean?
Sum of scores divided by number of scores
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What are the advantages of mode?
1) Probability of randomly drawn score is higher than probability that randomly drawn observations equals any other score 2) applicable to all types of data
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Disadvantages of mode
May not represent central tendency at all
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What are advantages and disadvantages of the median?
A - Unaffected by extreme scores, only requires ordinal measurement / D - not ideal as basis for inferential statistics
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What are advantages and disadvantages of mean?
A - simple formula, good estimator of population mean / D - sensitive to extreme scores, requires at least interval level
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What are four measures of variability?
1. the range 2. interquartile range 3. variance 4. SD
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What is the range?
Distance between lowest and highest score in a sample
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What is the problem with the range?
it depends entirely on extreme values and is therefore sensitive to outliers.
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How do you work out interquartile range?
UQ - LQ
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What are the problems with the IQ?
1. Discards half of the data 2. Proportion of discarded data is arbitrary
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Variance
1. Average values 2. Subtract average from values 3. Square results 4. Average
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