Computing the mean, variance, and sd Flashcards
1
Q
how do you solve for the mean?
A
multiply x by the probability then add the results
2
Q
what equation is this? ∑ X*P(x)
A
Mean
3
Q
____ and ___ describe the amount of spread, dispersion, or variability of the items in a distribution.
A
variance and standard deviation
4
Q
____ measures how much the values in a dataset vary or spread out from the average (mean) value.
A
VARIANCE
5
Q
_____is the square root of the variance. It’s another measure of how spread out the values in a dataset are. It’s often more interpretable than variance because it’s in the same units as the original data.
A
STANDARD DEVIATION
6
Q
what is σ^2?
A
VARIANCE
7
Q
what is σ?
A
STANDARD DEVIATION
8
Q
what is this equation 𝝈𝟐𝒙 = ∑(𝒙 − 𝝁𝒙)𝟐 ∙ 𝑷(𝑿)?
A
VARIANCE
9
Q
A
