Lecture 3 - Statistical Inference Flashcards
1
Q
When are the mean, mode, and median the same?
A
normal distributions (bell curve)
2
Q
What does sigma represent?
A
population variance
3
Q
What does mu represent?
A
population mean
4
Q
What are representative or typical values ?
A
They fall within 1 SD of the mean.
68.36% of our population
5
Q
What are unrepresentative or atypical values ?
A
They fall outside of 3 SD’s of the mean (which includes 99.74% of our population).
6
Q
What are somewhat representative values ?
A
values that fall within 2 SD’s of the mean (this includes 95.44% of population)
7
Q
By convention, “unrepresentative” is generally accepted as __% of a set of data
A
5
8
Q
The middle ___% is representative and somewhat representative defined by +/- 1.96SD
A
95
