Inferential statistics Flashcards
What are inferential statistics?
make inferences about the population based on the samples tested
-The tests allow us to infer that a pattern in the data is likely to be due to chance so the hypothesis can be accepted and rejected
What are the 4 levels of measurments?
-Nominal
-Ordinal
-Interval
-Ratio
What is step one of inferential statistics
Look if the data is nominal or ordinal + (ordinal, interval and ratio)
What is step 2 of inferential statistics?
If the reaserchh is correlation or difference
What is a difference in inferential statistics?
A test for difference means that changes in one variable brings out another
A cause and effect relationship between variables
What is correlation in inferential statistics?
Relationship between variables isn’t always due to casual link
What design was used in your research?
-Independent measures- independant data
-Repeated measures- Related
-Repeated measures- Related
How do we use the correct test- Acronym
I- Independant data (independent measures)
Really- Related data (Repeated measures/ matched pairs)
Could- Correlation
Not- Nominal Data
Calculate- Chi-squared test
Sums- Sign test
On- Ordinal data
Monday- Mann Whitney U test
Without- Wilcoxon
Smiling- Spearman’s rho
Test table?
Indene Related Correl
-ndant Data ation
data MP
IM RM
Nom Chi Sign
ial squared test
Data test
Ordi Mann Wilcoxon
nal Whitney Spea
Data U test rman
Rho
What is probability expressed as?
P
What do you do after the inferential test is carried out?
decide if we reject or accept the hypothesis to do this we determine the probability level
What is the standard probability?
0.05
What’s the stringent level of probability?
In medical research
What should a good scientific theory be?
Falsifiable, its ability to be proven wrong or right
What should we do once we have inferential test findings?
if its significant (not due to chance)
Or if its non significant (due to chance)