Statistics Chapters 4-5 Flashcards
What is bivariate data?
Data which has pairs of values for two variables
What is correlation?
The nature of the linear relationship between two variables
How can you determine if two correlated pieces of data have a causal relationship?
Use the context from the question and common sense
What is the regression line?
A line of best fit showing the change of one variable in relationship to another
How is the regression line of y on x written?
y = a + bx
b: change in y for each unit change in x
When can a regression line be used to make predictions? (2)
For the value of the dependent variable (not independent)
Within the range of the data (never extrapolate)
What is a Venn diagram used for?
Representing events graphically using probabilities or frequencies
What is true for mutually exclusive events?
P(AUB) = P(A) + P(B)
What is true for independent events?
P(AΠB) = P(A) x P(B)
What does a tree diagram show?
The outcomes of two or more events happening in succession