CHI SQUARED

Question 1

What is chi-squared

Answer 1

A statistical test that is used to determine whether differences between observed and expected result are significant.

Question 2

Give the process of working out a chi-squared

Answer 2

1. Work out expected results using the ratios from the genetic cross and total amount of observed numbers.
2. Minus the expected number from the observed number.
3. Square the answer.
4. Divide that answer by the expected numbers to give you a decimal for each phenotype.
5. Add the decimal for each phenotype to get your final answer.

Question 3

What does the table used to gain a different number show

Answer 3

The new number is the probability that the difference between the expected and observed results are due to chance.

Question 4

What probability is deemed ok
And what does it mean

Answer 4

0.05
Means that these differences would occur in 5 out of every 100 experiments.

Question 5

What is usually the null hypothesis
(Stated before test)

Answer 5

there is no difference between your observed and expected results

Question 6

What should the answer be if the probability is 0.05 or larger
Does this support or reject the null hypothesis

Answer 6

The difference between the observable and expected results are due to chance and there is no significant difference between expected and observed.
Supports.

Question 7

What is degrees of freedom

Answer 7

The number of comparisons made

Question 8

How do you wrk out degrees of freedom

Answer 8

The number of classes minus 1