Term
Uniform probability distribution 

Definition
Distribution where the intervals of random variable X have an equal probabilitiy of occurring 


Term
Probability density function, (pdf) 

Definition
An equation used to compute probabilities of continuous random variables 


Term

Definition
1. The total area under the graph of the equation over all possible values of the random variable must equal 1 2. The graph of the equation must lie on or above the horizontal axis for all possible values of the random variable 


Term
The area under the graph of a density function represents 

Definition
The probability of observing a value of the random variable in that interval 


Term

Definition
A continuous random variable that has a normal probability distribution 


Term

Definition
Points on the normal curve where the curvature of the graph changes 


Term

Definition
1. mew  sigma 2. mew + sigma 


Term
1. Properties of the normal density curve 

Definition
It is symmetric about its mean, mew 


Term
2. Properties of the normal density curve 

Definition
Mean = median = mode, and there is a single peak and the highest point occurs at x = mew 


Term
3. Properties of the normal density curve 

Definition
I has inflection points mew  sigma and mew + sigma 


Term
4. Properties of the normal density curve 

Definition
The area under the curve is 1 


Term
5. Properties of the normal density curve 

Definition
The area under the curve to the right of mew equals the area under the curve to the left of mew 


Term
6. Properties of the normal density curve 

Definition
A x increases/decreases without bound, the graph approaches but never reaches the horizontal axis 


Term
7. Properties of the normal density curve 

Definition


Term

Definition
Approximately 68% of the area under the normal curve is between x = mew  sigma and x = mew + sigma 


Term

Definition
Approximately 95% of the area under the normal curve is between x = mew  2sigma and x = mew + 2sigma 


Term

Definition
Approximately 99.7% of the area under the normal curve is between x = mew  3sigma and x = mew + 3sigma 


Term
The area under the normal curve for any interval of values of the random variable X represents either 

Definition
1. The proportion of the population with the characteristic described by the inverval of values 2. The probability that a randomly selected individual from the population will have the characteristic described by the interval of values 


Term
Standad normal distribution 

Definition
Z = X  mew/sigma with mew = 0 and sigma = 1 

