Statistics - Test 3 Flashcards
0
Q
discrete random variable
A
assumes countable values in an interval and nothing in between
- # of pets, # of cars
1
Q
continuous random variable
A
assumes any value in one or more intervals
- weight, length of room
2
Q
characteristics of normal distribution
A
- total area under the curve is 1
- curve is symmetric about the mean
- the two tails of the mean extend indefinitely
3
Q
parameters of the normal distribution
A
mean (μ) & standard deviation (σ)
4
Q
z-score
A
- units marked on the horizontal axis of the standard normal curve
- denoted by z
- specific value of z gives the distance between the mean and the point z in terms of standard deviation
5
Q
properties of discrete random variables
A
- 0 <_ 1 for each x
2. ΣP(x) sum of all probabilities is 1
6
Q
properties of continuous random variables
A
- the probability that x assumes a value in any interval is between 0 and 1
- the total probability of all intervals is 1
7
Q
characteristics of the standard normal distribution
A
μ = 0 σ = 1