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Elementary Statistics-Unit 3
Statistics keywords
10
Mathematics
Undergraduate 1
05/28/2013

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Term
Discrete
Definition
A random variable with a finite/countable number of possible outcomes.
Term
Continuous
Definition
A random variable that has an uncountable number of possible outcomes.
Term
Discrete probability distribution
Definition
Lists each possible value the random variable can assume together with its probability. It has 2 conditions: 1. The variable is between 0 and 1; and 2. the sum of all probabilities is 1.
Term
Mean of a discrete random variable
Definition
Each value of x is multiplied by its corresponding probability and the products are added.
Term
Binomial Experiment
Definition
A probability experiment that has the following conditions:1) it is repeated a fixed number of times; 2) there are 2 possible outcomes, success (s) or failure (f); 3) the probability for success is the same for each trial;the random variable x counts the number of successful trials.
Term
Continuous random variable
Definition
It has an infinite number of possible values that can be represented by an interval on the number line.
Term
Continuous probability distribution
Definition
Probability distribution of a continuous random variable.
Term
Normal distribution
Definition
A continuous probability distribution for a random variable x. It can be used to model many sets of measurements in nature, industry, and business. Its graph is called a Normal Curve.
Term
Normal distribution properties
Definition
1) The mean, median, & mode are equal; 2) the normal curve is bell-shaped and is symmetric about the mean; 3)the total area under the curve is equal to 1; 4) the curve approaches but never touches the x-axis. It can have any mean and positive standard deviation.
Term
standard normal distribution
Definition
A normal distribution with a mean of 0 and a standard deviation of 1. The horizontal scale of the graph corresponds to z-scores.
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