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
What are the 4 different levels of measurement?
- NOMINAL
- ORDINAL
- INTERVAL
- RATIO
What are the catogries of ‘nominal’ and the properties?
different catergories
What are the properties of ‘ordinal’ data?
different catergories
catergories can be ranked
What are the properties of ‘interval’ data?
different categories
categories can be ranked
equal distances between categories
What are the properties of ‘Ratio’ data?
Different categories
catergories can be ranked
equal distances between catergories
fixed zero
What are the 4 ways of presenting descriptive data?
tables
charts
measures of central tendancy
measures of dispersion
How do tables display data?
allow data from different variables to be displayed together
How do charts display data?
have an immediate visual impact
