2-Var Quantitative Data
A relationship where both variables increase together.
What is a positive correlation?
A group in an experiment that does not receive the treatment.
What is a control group?
Random, 10%, and large counts conditions.
What are the conditions for a 1-proportion z-interval?
Events that cannot happen at the same time.
What are mutually exclusive events?
A correlation coefficient of 0.92.
What is a strong positive linear association?
Using a large enough number of subjects to ensure reliable results.
What is replication?
A 95% confidence interval ranges from 0.42 to 0.58.
What is an interval that captures the true population proportion with 95% confidence?
P(A or B) = P(A) + P(B) − P(A and B)
What is the general addition rule?
The amount the predicted y changes for every one-unit increase in x.
What is the slope of the least-squares regression line?
A study that does not assign treatments.
What is an observational study?
The chance of getting your sample results or more extreme if the null hypothesis is true.
What is a p-value?
8 out of 10 marbles are red or green.
What is the probability of selecting a red or green marble?
The observed value is 10 and the predicted value is 8.5.
What is a residual of 1.5?
Dividing experimental units into groups before randomly assigning treatments.
What is blocking?
A confidence interval for a population proportion is calculated to be (0.31, 0.45). This is the margin of error.
What is 0.07?
The probability of all tails in 5 coin flips.
What is (0.5)^5 or 0.03125?
64% of the variability in y is explained by the regression model.
What is the meaning of an R² value of 0.64?
A method where neither the participant nor evaluator knows the treatment assignment.
What is a double-blind experiment?
You fail to reject the null hypothesis that the population proportion is 0.25, but in reality, the true proportion is different.
What is a Type II Error?
The expected gain in a game where you win $10 with P=0.2 and lose $2 with P=0.8.
What is 0.4 dollars?