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Flashcards in Statistics - Test 3 Deck (8)
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0

continuous random variable

assumes any value in one or more intervals
- weight, length of room

1

discrete random variable

assumes countable values in an interval and nothing in between
- # of pets, # of cars

2

characteristics of normal distribution

1. total area under the curve is 1
2. curve is symmetric about the mean
3. the two tails of the mean extend indefinitely

3

parameters of the normal distribution

mean (μ) & standard deviation (σ)

4

z-score

- 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

properties of discrete random variables

1. 0 <_ 1 for each x

2. ΣP(x) sum of all probabilities is 1

6

properties of continuous random variables

1. the probability that x assumes a value in any interval is between 0 and 1
2. the total probability of all intervals is 1

7

characteristics of the standard normal distribution

μ = 0
σ = 1