100% satisfaction guarantee Immediately available after payment Both online and in PDF No strings attached
logo-home
Previously searched by you
Previously searched by you
logo
Summary Inferential tests £2.99
Add to cart
Quickly navigate to
Preview
  2.  
  3. Canterbury College (CC)
  4.  
  5. Psychology
  6.  
  7. Research Methods

Summary

Summary Inferential tests

 225 views  0 purchase

Psychology revision notes on 'Psychological Research and the Scientific Method'. The notes are tailored to suit the Psychology AQA A-level Specification A syllabus. The essay plans are colour coded to make revision slightly more interesting.

Preview 1 out of 4  pages

Document information

  • March 19, 2016
  • 4
  • 2014/2015
  • Summary

Subjects

Written for

All documents for this subject (8)

Seller

avatar-seller
JasmineLawrence

Reviews received

Content preview

INTRODUCING INFERENTIAL TESTS

 NULL HYPOTHESIS (H₀) – statement of no effect (no difference or no
correlation).
 ALTERNATIVE HYPOTHESIS (H₁) – a statement that there is an effect
between two variables.
 DIRECTIONAL HYPOTHESIS – a statement that predicts the direction
of the relationship between two variables.
 NON-DIRECTIONAL HYPOTHESIS – a statement that predicts a
difference between two variables but doesn’t suggest what
difference.

PROBABILITY
 Inferential tests are used to work out whether a difference is or is
not significant.
 These tests allow you to work out, at a given PROBABILITY, whether
a pattern in the data could have arisen by CHANCE or whether the
effect occurred because there is a real difference/correlation.
 CHANCE = refers to something with no cause.
 You can’t be 100% certain that an observed effect was not due to
chance but you can state how certain you are.
 Usually psychologists use a probability of 95%.
 This expresses the degree of uncertainty.
 It means there is a 5% chance (probability) that the results would
occur even if there was no real difference/correlation between the
two variables.
 This probability of 5% is recorded as:
P = 0.05 (P means probability)
 Sometimes psychologists want to be more certain, so may use a
stricter probability, such as p<0.01 or p<0.001.
 The chosen value of ‘p’ is called the SIGNIFICANCE LEVEL.


USING INFERENTIAL TESTS
 Inferential tests help us to draw inferences about populations based
on the samples tested.
 These tests allow us to infer that a pattern in the data is likely (or
not) to be due to chance.

OBSERVED + CRITICAL VALUES
 Each inferential test involves taking the data collected in a study +
doing some calculations to produce a single number called the TEST
STATISTIC.

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 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 JasmineLawrence. Stuvia facilitates payment to the seller.

Will I be stuck with a subscription?

No, you only buy these notes for £2.99. You're not tied to anything after your purchase.

Can Stuvia be trusted?

4.6 stars on Google & Trustpilot (+1000 reviews)

53340 documents were sold in the last 30 days

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

Start selling
£2.99
  • (0)
Add to cart
Added