chapter 11 good Flashcards
1
Q
What is the point estimator of Pop Variance
A
Ssquared = sum (x1-xbar)squared / n-1
2
Q
What is the chi-squared distribution used for
A
pop variance with n-1 degrees of freedom
3
Q
what is the formula for chi-squared dist
A
(n-1)Ssquared / Qsquared
4
Q
what type of distribution does a Chi-squared distribution uses what type of distribution and what is it used for?
A
normal distribution, tis is used to develop interval estimates and hyp tests about a Pop variance
5
Q
is the chi distribution centered around zero
A
NO
6
Q
is the chi distribution normally distributed
A
no
7
Q
what area do you look for when using the chi distribution
A
area to the right (opposite of what we usually do)
8
Q
chi-squared is skewed a little bit to the
A
right
