This is a complete summary for the second year psychology course 'Correlational Research Methods' , which includes all the book chapters (written in black), and all the lecture notes (written in blue) of the semester. I also did all the practice exercises, and added some extra notes and example to ...
If X remains equal and N increases, Om decreases /up until v 1000)
· =
=larger sample size yields smaller estimation errors
IfN is constant, And O of scores increases Om increases
↑
.
↳small Om is good because it indicates that M scores are close , to M ,
so less
Prediction error ,
so magnitude of sampling error is small
Distance from M to M
· location of a
single X score
by computing a z-score
(M
32 =
· location of sample mean Example :
2 N = 130 M = 73 76 . 0 7 062
=
.
population
n= 9 M 76 22
=
.
sample
Among .354
2
z-values above 1 96 .
are considered
-if do not have we O ,
use SD Question : is M far from M ? far fram M
=SEm=
6.
->
for 95% confidence interval , no
characteristics
=same
formula , same
↳ But it does have 2 errors ; SD & M
the t distribution (or when sample is small
so : if O is not known ,
we use
t =
M
-
-
Mo ->
M = No + toSEm
SEM
Tdistributions ↓
degrees of freedom :
n 1-
-> the
larger of ,
the more normal the curve
->
When af >120 ,
the sample error of SD becomes negligible
= close to o = known
note af D =
normal distribution
=Middle 95% with increasing of
The benefits of buying summaries with Stuvia:
Guaranteed quality through customer reviews
Stuvia customers have reviewed more than 700,000 summaries. This how you know that you are buying the best documents.
Quick and easy check-out
You can quickly pay through credit card or Stuvia-credit for the summaries. There is no membership needed.
Focus on what matters
Your fellow students write the study notes themselves, which is why the documents are always reliable and up-to-date. This ensures you quickly get to the core!
Frequently asked questions
What do I get when I buy this document?
You get a PDF, available immediately after your purchase. The purchased document is accessible anytime, anywhere and indefinitely through your profile.
Satisfaction guarantee: how does it work?
Our satisfaction guarantee ensures that you always find a study document that suits you well. You fill out a form, and our customer service team takes care of the rest.
Who am I buying these notes from?
Stuvia is a marketplace, so you are not buying this document from us, but from seller noortjedejonglml. Stuvia facilitates payment to the seller.
Will I be stuck with a subscription?
No, you only buy these notes for $6.65. You're not tied to anything after your purchase.