Chi squared Flashcards
1
Q
A
2
Q
When do you use chi-squared?
A
used to investigate differences when frequencies (counting) is involved
3
Q
What can chi-squared used to determine?
A
whether there is a significant difference between expected and observed frequencies
4
Q
How do you work out the degrees of freedom?
A
number of categories - 1
5
Q
What do you do after you have calculated the chi-squared value?
A
compare it to critical values,
6
Q
What does O stand for?
A
Observed
7
Q
What does E stand for?
A
Expected
8
Q
How do you work out expected frequency?
A
use ratio from Punnett square and total number of observed
9
Q
Explain why you might choose to use chi squared?
A
categorical data
showing observed and expected
