Chi squared

Question 2

When do you use chi-squared?

Answer 2

used to investigate differences when frequencies (counting) is involved

Question 3

What can chi-squared used to determine?

Answer 3

whether there is a significant difference between expected and observed frequencies

Question 4

How do you work out the degrees of freedom?

Answer 4

number of categories - 1

Question 5

What do you do after you have calculated the chi-squared value?

Answer 5

compare it to critical values,

Question 6

What does O stand for?

Answer 6

Observed

Question 7

What does E stand for?

Answer 7

Expected

Question 8

How do you work out expected frequency?

Answer 8

use ratio from Punnett square and total number of observed

Question 9

Explain why you might choose to use chi squared?

Answer 9

categorical data
showing observed and expected