Week 5 Flashcards
What are the two basic approaches to statistical analysis?
Hypothesis Testing
Estimation
What does hypothesis testing approach use?
P values
What does Estimation Approach use?
Confidence intervals
What is a P value?
P value is the probability of obtaining the study results if the null hypothesis is true
What should the P value be if the null hypothesis should be rejected?
Closer it is to 0
What is the P value range?
0 and 1
When will the evidence reject a null hypothesis?
p> 0.05
What is the ‘power’ of a study?
being able to detect a difference between the study groups
How is a ‘power’ of a study displayed?
percentage
What is a ‘confidence interval’?
A measure of the precesion with which the quantitiy of interest is stimulated.
A type 2 error is?
a false negative result?
Statistics that produce ‘p values’ are called?
inferential statistics
Baseline data is?
the data collected before the intervention but after recruitment
Which level of measurement has a fixed zero?
ratio
What are descriptive statistics?
a way of displaying and summerising data
