Probability Distributions

Term Definition
Probability Distribution provides probabilities for the possible values of a random variable; summarized by measures of the center (mean) and the spread (standard deviation)
Random Variable a numerical measurement of the outcome of a random event
Expected Value the mean of a probability distribution for a discrete random variable
Normal Distribution the probability distribution of a continuous random variable that has a symmetric bell-shaped graph specified by mean and standard deviation
Standard Normal Distribution it is the distribution of normal z-scores; the normal distribution with a mean = 0 and standard deviation = 1
Binary Data data that has one of two possible outcomes
Binomial Distribution the probability distribution of the discrete random variable that measures the number of successes X in n independent trials with the probability p of a success on a given trial.
Sampling Distribution the probability distribution of a sample statistic; specifies the probabilities for the values of the statistic for all possible random samples
Sampling Distribution of the Mean centered at the population mean
Standard Error the standard deviation that describes the spread of the sampling distribution of the sample mean