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22 terms

AP Statistics Vocab Set 4

used to help study and remember vocab for the AP Stats test
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Trial
A single attempt or realization of a random phenomenon
Outcome
Value that is measured or reported from a trial
Sample Space
Collection of all possible outcomes
Law of Large Numbers
The long run probability will approach its theoretical probability
Independence
When the probability of one event occurring has no affect on the probability of a second event occurring
Probability
A number between 0 and 1 that describes the chance of an event occurring
Disjoint
When two events share no common outcomes
Mutually Exclusive
When two events share no common outcomes
Expected Value
The theoretical long-run average value. AKA the mean
Bernoulli Trials
Have 2 outcomes, probability of a success is constant, trials are independent
Geometric Probability Model
Counts the number of Bernoulli trials until the first success
Binomial Probability Model
Counts the number of successes in n trials
Central Limit Theorem
The sampling distribution model of the sample mean and proportion from a random sample is approximately normal for large n regardless of the distribution of the population as long as observations are independent
Standard Error
When we estimate the standard deviation of a sampling distribution using statistics found from the data
Confidence Interval
An interval used for estimating a parameter
Margin of Error
Tells you the "give or take" from a confidence interval
Alpha Level
The "threshold" p-value that determines whether we reject a null hypothesis
Statistically Significant
When the p-value falls below the alpha level
Significance Level
Another name for alpha level
Type I Error
Rejecting a null hypothesis when it is true. (Also called a false positive) usually denoted by α
Type II Error
Failing to reject a null hypothesis when it is falso (Also called a false negative) usually denoted by β
Power
The probability that a hypothesis test will correctly reject a false null