Chi square test
The Chi square test is a statistical test used to determine whether two groups are interrelated. In this test the association between two qualitative variables is determined using a quantitative way.
O – Observed value
E – Expected value. Before the experiment you can figure out what data is expected in your experiment.
Null hypothesis
H0 : There is no significant difference between observed values and expected values
Confidence Interval and Probability level.
In most experiments, 5% probability level is used. That means a 95% confidence interval. You can use a different probability level like 1% or 10% probability based on the errors you expect in the test.
What is 95% confidence interval?
95% confident, or simply saying 95% sure, that you are accepting or rejecting your value.
