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| Sample is not representative of population of interest, |
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| numeric characteristic pertaining to a population |
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| variable that helps explain the data but is not accounted for in the study |
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Quantitative - numeric
Qualitative - names, categories, descriptive |
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| Two levels of quantitative variables |
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Continuous - numeric values that can be given to an arbitrary number of decimal places. MEASURED
Discrete - only integer responses make sense. COUNTED |
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| Two levels of qualitative variables |
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Ordinal - placed in a set order
Nominal - order does not matter |
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| X with a line over it, means the MEAN of the data |
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| Inner quartile range - the distance between Q1 and Q3 |
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| Sum of Squared Deviations |
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SS
Squared deviation: subtract the mean from one observation, square the result.
Sum of squared deviations: add all squared deviations together |
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variance
sample standard deviation (square root of sample variance) |
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| probability of a specific outcome over the long run |
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P(A) is the probability that A occurs
Ac is the compliment of event A
P(A|B) probability of A, given that B has occurred. |
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Dependent : If knowing that one event has occured gives you addtl. information about the probability that the other will occur
Independent : knowing the outcome of one does not give you info about the probabilty of the other occurring.
A and B are independent if:
P(A|B) = P(A) or P(B|A) = P(B) |
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