Statistics Definitions
What is the average of a data set?
Mean
What is the likelihood of an event occurring (0 ≤ P ≤ 1)?
Probability
What measures the strength and direction of a linear relationship?
Correlation (r)
What distribution is symmetrical and bell-shaped?
Normal Distribution
What is the whole group called in statistics?
Population
What is the middle value when data is ordered?
Median
What are events where the outcome of one does not affect the other?
What is it called when as one variable increases, so does the other?
Positive Correlation
What is the number of standard deviations a value is from the mean?
Z-Score
What is a subset of the population called?
Sample
What is the most frequently occurring value?
Mode
What are events where the outcome of one affects the other?
Dependent Events
What is it called when as one variable increases, the other decreases?
Negative Correlation
What distribution is used for binary outcomes (success/failure)?
Binomial Distribution
What is the range of values likely to contain the population parameter?
Confidence Interval
What is the difference between the highest and lowest values?
Range
What is the complement rule formula?
P(A') = 1 - P(A)
What predicts the value of a variable based on another using a line?
Linear Regression
What distribution models the number of events in a fixed interval?
Poisson Distribution
What is the procedure to test assumptions about a population?
Hypothesis Testing
What measures the spread of data around the mean?
Standard Deviation
What is the addition rule formula?
P(A or B) = P(A) + P(B) - P(A and B)
What is the proportion of variance explained by the model?
Coefficient of Determination (R²)
What distribution has all outcomes equally likely?
Uniform Distribution
What is the threshold for rejecting the null hypothesis?
Significance Level (α)