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# States review

### Statistics information to learn

TermDefinition
Variance? The average of squared deviations from mean
How is the empirical rule used 68% fall within the positive negative 1 S.D., 95% fall within the positive negative 2 S.D, and 99.7% fall within the positive negative 3 S.D.
Explanatory variable It helps explain or predict changes in a response variable (independent)
Response variable It measures outcomes in a study or how it is affected by explanatory (dependent)
Voluntary response sample A method of sampling that allows people to choose to be in the sample by responding to a general invitation.
Convenience sample A method of sampling that selects individuals from the population who are easy to reach.
What is the difference between single blind and double blind in a convenience sample? Single: One group knows while the other group doesn't. Double: Neither groups know what treatment they are receiving.
Law of large and small numbers Law of large numbers: As we observe more and more trials of any random process, the proportion of times that a specific outcome occurs approaches its true probability. Law of small numbers: doesn't exist but people believe in it "third time is a charm"
Random variable Takes numerical values that describes the outcomes of a random process.
Outliers The observations that lie outside the pattern of a distribution.
Statistics Number that describes the sample for example the sample mean or (xbar)
Created by: user-1829487
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