Unit 1
What is a variable?
A characteristic that can take different values for different individuals
What is a response variable?
A variable that measures the outcome of an observation or study
What is a sample?
A small selection from a group, that represents the whole population
What is an event?
A specific desired outcome or set of outcomes
What is a point estimator?
A statisitc that provides an estimate of the population parameter
What is a discrete variable?
A quantative variable that takes a countable set of possible values w/ gaps between them on a number line
What is an explanatory variable?
A variable that drives the change in the response variable
What is an observational study?
A study that collects data on variables of interest, no treatments on subjects
What are independent events?
What is a point estimate?
The value of a point estimator from a sample
What is a continuous variable?
A quantative variable that can take any value in an interval on the number line
What does "r" mean?
The correlation that measures the strength of a linear relationship
What is an experiment?
What are dependent events?
Events with outcomes that influence each other
A range of values that gives a plausible estimate for the value of a parameter based on sample data
What is the range?
The distance between the minimum value and the maximum value
The ratio of the frequency in a cell and the total number of data values
What is voluntary response bias?
Bias that over-represents individuals w/ strong opinions
What is a random variable?
A variable designed to assign numerical values to the output of an experiment
What is the margin of error?
How far, at most, we expect the point to vary from the population parameter
What is the mean?
The average of all individual data values
What is a marginal relative frequency?
The ratio of the sum in a row or column and the total number of data values
What is blinding?
When the subject doesn't know what group they're in during an experiment
What is the expected value?
The mean of the probability distribution of X
What is a critical value?
The z-score that makes the interval wide enough to match your confidence level