10-10 Estimating the Population Mean When the Standard Deviation Is Unknown Flashcards
1
Q
What is a t-distribution ?
A
a distribution of t-scores [t = (m − μ)/sm] computed from all possible samples of size n, drawn from a normal distribution.
2
Q
True or false ?
A
We vassociate t-distributions with degrees of freedom (df) rather than sample size (n).
3
Q
What is the equation for df ?
A
n-1
4
Q
What is Degrees of freedom (df)?
A
It refers to the number of independent variables required to account for a given source of variance (treatment, variable, or error) in a regression (or ANOVA) analysis.
5
Q
What is the formula for a t-score ?
A
t= (m-u)/sm
6
Q
What is the formula for sd?
A
sqrt of ((d^2/(2*df) + (1/n))
7
Q
Do we use za/2 or ta/2 for d ?
A
za/2
8
Q
Whats the formula for finding d ?
A
m-u/s
