Choosing a Statistical Test
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- To KNOW and UNDERSTAND how to choose the correct inferential statistical test
- To ANALYSE novel studies and APPLY the decision criteria to determine the correct statistical test.
- To CREATE a mnemonic to revise the decision criteria
- Can you remember what P.<0.05 are, and what a type one error is?
- Attempt an exam question of the likelihood of making a type 1 error
- Revise and if needed take notes on the three levels of data
- Revise and if needed take notes of experimental designs
- Revise and if needed take notes on difference vs relationship
- Take note of the decision diagram to learn off by heart.
- Use decision criteria in order to decide which test should be used for 6 research studies and justify the answer.
- Redesign the study in some way that would change which statistical test would be needed,.
Difference: Is the study testing a difference between two groups or a relationship between two things?
Design: If it is a test of difference, which experimental design did it use?
- Unrelated Data: Data that has been taken from studying two groups which are not related to each other (independent groups).
- Related Data: Data that has been taken from studying two groups which are related to each other (repeated measure or match pairs).
Data: What type of measurements did they use?
- Nominal Data: Data that can be put in categories. For example Pass/Fail or Improve/Decline/Stay Same.
- Ordinal Data: Data which shows us who was better than who (the order) but without any specific measurements. For example GCSE Grades, Scale 1-10.
- Interval Data: Data which have standardised and specific measurements. For example GCSE Marks, Time.
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Study Notes (TBC):
If you would like to download a set of study notes for this lesson, you can do so here. If you would like access to the original word file please tweet @psychopepper
TEXTBOOKS OR EXTRA READING:
I would suggest that you have a copy of one of the textbooks which will allow you to read around the subject matter, pre-read ahead of lessons or even take extra notes/practise questions afterwards. I would recommend the following (you do not need to replicate books, one of each type is plenty!)
- Complete Companion Series:
- Psychology for A Level: