Chi-squared test Flashcards Preview

Y13 A2 Biology > Chi-squared test > Flashcards

Flashcards in Chi-squared test Deck (7)
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1
Q

What would the null hypothesis be for a chi squared test be?

A

There is no signifiant difference between the expected and observed results

2
Q

When do you use a chi squared test?

A

When using categorical data

When comparing observed and expected results

3
Q

How do you calculate the expected number of offspring?

A

Total number of offspring/ratio total x predicted ratio

4
Q

How do you calculate degrees of freedom?

A

Number of classes minus one

5
Q

What probability level do you use?

A

0.05

6
Q

What happens if your calculated chi squared value is more than or equal to the critical value?

A

reject the null hypothesis
Something other than chance is causing the difference
There is a significant difference in the results

7
Q

What happens if your calculated chi squared value is smaller than the critical value?

A

accept the null hypothesis
Chance is more than likely causing the results
No significant difference in the observed and expected results
This is what you want