Statistics Chapter 6: Probability Distributions Flashcards
What is a random variable?
A random variable is a numerical measurement of the outcome of a random phenomenon.
What does discrete mean
It has separate possible values (1,2,3)
What does continuous data mean
Possible values that have an interval rather than a set of separate numbers.
How do you get the mean of a probability distribution
Multiply each possible value of a random variable by its probability and then add these products
When is a weighted average used
When each value of x isn’t equally valuable
What does the expected value of x mean?
The mean of the probability distribution of the variable x
How could you get a probability distribution for 2 categorical variables?
Denoting them as 1 and 0.
What is the normal cumulative probability?
The probability below the point ⬅️ on the normal distribution.
