Chi Squared Test

Question 1

What is the Chi Squared Test used for?

Answer 1

To see if the results of an experiment support a theory.
To determine the significance of the difference between observed and expected results
To test null hypothesis

Question 2

What is the equation for the Chi Squared Test?

Answer 2

x^2 = sum of ({O-E}^2 / E)

Question 3

How do you calculate the expected numbers?

Answer 3

(ratio/total in ratio) x total observed

Question 4

How do you calculate the degrees of freedom?

Answer 4

Number of classes - 1

Question 5

When would you reject and accept the null hypothesis?

Answer 5

Less than 5% = reject
More than 5% = accept

Question 6

List the possible reasons for a significant difference between the expected and observed results.

Answer 6

Linkage: genes have loci on the same chromosome
Random natura of the fertilisation of haploid gametes
Mutations: chromosome and genes
Meiosis: exchange of genetic material in crossing over in prophase I and random assortment in metaphase I & II