Quantifying Errors Flashcards
1
Q
what is unbiased variance?
A
s^2 = 1/n-1 x sumofsquares
2
Q
what is standard deviation?
A
sd = root s^2
a quantity expressing by how much the members of a group differ from the mean value for the group.
3
Q
what is standard error?
A
se = sd/rootn
the se is the standard deviation of the sample mean, used to indicate uncertainty around the same mean estimate of the population mean
as n increases, se decreases
4
Q
what is the 95% confidence interval?
A
CI0.95 = 1.96xse
the probability that a value falls within the interval between -1.96 and 1.96 on the x-axis is 95%
