Inferential Statistics (research Methods) Flashcards
What are inferential statistics
Tests of statistical analysis
What are skewed distribution curves
Skewed distribution curves are when it is not symmetrical at the meab( or median or more) point. A skew can be positive and negative
What is positively skewed distribution
The long tail is going in a positive direction.
Low measure of central tendency
What is negatively skewed distribution
The long tail is going in a negative direction
High measure of central tendency
Define probability
The extent to which something is likely to happen or be the case
What are the different ways of expressing probability
Standard form
Decimal
Percentages
In psychology, how confident do you need to be that the results are significant and not due to chance
Atleast 95% confident Expressed like this P<0.05 P stands for probability < less than 0.05 is 5% expressed as a decimal
What are the two tests used in psychological research ?
Parametric tests
Non- parametric tests
What are parametric tests
Parametric tests can only be used for normally distributed data
What are non parametric tests
Non parametric tests are used for normal or skewed distribution.
Most research produced skewed data so non- parametric tests are more common
What are the parametric tests criteria
1) normally distributed data
2) variance is equal
3) interval data
4) no extreme scores
What are the non- parametric tests criteria ?
- when assumptions if the parametric test ms cannot be fulfilled
- when distributions are not normal
What are the 5 non- parametric tests
- Mann- Whitney U test
- Wilcoxon signed Ranks data
- Chi square
- Binominal sign data
- spearman’s Rho
What is the type 1 error
When the bill hypothesis is rejected and the alternate is wrongly accepted
What is type 2 error
When the alternate is wrongly rejected and the null is wrongly accepted
