Stats Flashcards
Mean
Average add sum/number
Median
When is it preferred?
Rank lowest to highest
Middle value
Preff: in ordinal and continuous data
Mode?
Number than happens most frequently
Pref for nominal
Range?
Difference between largest and smallest
Normal distribution note
Mean median and mode are the same
Where do values fall in normal distribution?
68% within 1 SD
95% fall within 2 SDs
What is the possible error margin called?
APLHA
Alpha commonly set?
5%
When is the null rejected?
When the P-value is <0.05 if that is where the alpha is set
CI equation>
CI=1-a
If a CI contains what?
0 not statistically significant
FOR MEANS
Ration data? Three examples?
OD, HR, RR
CI confidence interval in ration data?
If it includes 1 not statistically significant
Type 1 errors? Also called?
Falso positive
Type 1 error in relation the H0 and Ha?
Alternative hypothesis was accepted and Null rejected in error
Type II is also called? How is it denoted?
False negative
B
Alternative was rejected and Null accepted in error
What is study power?
Probability that the test will reject the null correctly