The Normal Distribution Flashcards
1
Q
In any normal distribution…
A
the mean, median and mode coincide
2
Q
What is the z-score
A
the number of standard deviations that x lies above/below (if z is -ve) the mean
3
Q
What does the PDF of Z look like
A
a bell shaped curve
4
Q
Y-intercept of the standard normal distribution
A
1/square root of 2 pi = 0.4
5
Q
The cumulative distribution function tables are all valid for
A
P(Z
6
Q
To find a probability >
A
1-P(Z
7
Q
What is the empirical rule
A
- 1 –> 1 = 68%
- 2 –> 2 = 95%
- 3 –> 3 = 99.7%
