Hypothesis testing Flashcards
1
Q
how do you work out the Zc on a calc?
A
distr-> norm -> invN-> chose the area, the area and set SD as 1 and mew as 0
2
Q
how do you work out Zc?
A
Xbar- Mew/(s or sigma/ root n)
3
Q
type 1 error
A
reject H0 when it is true
4
Q
type 2 error
A
reject H1 when it is true
5
Q
when do you use T
A
if σ is unknown so you have to use s
and n is smaller than 30
6
Q
when do you use Z
A
if σ is known
if σ is unknown but n is bigger than 30
7
Q
How do you work out the Tc on a calc
A
distr-> t -> InvT: input area and the degrees of freedom (n-1)
8
Q
what do you need to be concious of when inputting the area of the t distr when finding Tc
A
that if its central you need to add 1/2 of the last unit to the area e.g. central area of 0.95 then input 0.975 as your area
