100% satisfaction guarantee Immediately available after payment Both online and in PDF No strings attached
logo-home
summary statistics and methodology part 2 $6.36   Add to cart

Summary

summary statistics and methodology part 2

 7 views  0 purchase
  • Course
  • Institution

I passed this exam with the help of this summary with an 8! It contains all lecture material including all slides. NOTE: contains not a lot more than the slides

Preview 4 out of 61  pages

  • June 21, 2023
  • 61
  • 2022/2023
  • Summary
avatar-seller
Summary statistics and methodology, methodology

Lecture 6, Power
Scientific studies are sometimes bound to fail (wrong resources, not reading literature
beforehand)

Definition of statistical power: The probability to detect an effect that is actually there
Or: The probability to reject H0 when it is incorrect
- Under-powered studies are bound to fail

The probability to reject H0 when it is incorrect is determined by:
- Sample size
- Effect size
- Experimental design
- Etc.

,Example 1:
Do men and women from the regular population score differently on an IQ test?
Given: H0 is true: there is no difference




Mostly we find a T-value of 0




However, when we find a high t-value: Type I error→ incorrect conclusion that M and F
differ

,Example 2:
Do men and women from the regular population score differently on an IQ test?
Given: H0 is false: there is a difference




Of what are these distributions?
- Distribution of the test statistic (in this case the t-value) under H0 and H1
- NOT the distribution of data

, All things being equal:
If alpha gets smaller, beta gets larger
If alpha gets larger, beta gets smaller




Alpha is mostly 0.05

The benefits of buying summaries with Stuvia:

Guaranteed quality through customer reviews

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

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

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 lvd26. Stuvia facilitates payment to the seller.

Will I be stuck with a subscription?

No, you only buy these notes for $6.36. You're not tied to anything after your purchase.

Can Stuvia be trusted?

4.6 stars on Google & Trustpilot (+1000 reviews)

66579 documents were sold in the last 30 days

Founded in 2010, the go-to place to buy study notes for 14 years now

Start selling
$6.36
  • (0)
  Add to cart