Chi squared test

Question 1

chi squared

Answer 1

to compare the goodness of fit of observed data with expected data

It tests if the difference between observed and expected values is due to chance

statistically signifcant

Question 2

formula

Answer 2

x2(chi squared = sum off (O-E) squared/E

Obtain the expected (E) and observed (O) results for the experiment

Calculate the difference between each set of results

Square each difference

It is irrelevant whether the difference is positive or negative

Divide each squared difference by the expected value

Add the resulting values together to get a sum of these answers to obtain the chi-squared value