# AQA A-level Biology Stats tests

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#1
Could somebody please help me to understand when you're supposed to use the Student's T-test, Chi-squared test and Correlation Coefficient.

From what I understand:

T-test is used to compare 2 means (but i don't know if it can be used when there's more than 2 means?).

Chi-squared is used to compare observed and expected values, but sometimes it's not clear that observed and expected values are being used so I believe a correlation coefficient is appropriate rather than the Chi-squared test. I don't really understand when to use the correlation coefficient test.

Thank you very much for any responses.
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1 year ago
#2
The student's T-test can only be used to compare two means, because the null hypothesis is: "The mean of X is equal to the mean of Y.".

I agree with you that it's very hard to tell when Chi-squared should be used in biology, but the way you can tell normally is: It uses frequency. Correlation coefficient questions will typically use numbers that aren't frequencies.
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#3
(Original post by Knortfoxx)
The student's T-test can only be used to compare two means, because the null hypothesis is: "The mean of X is equal to the mean of Y.".

I agree with you that it's very hard to tell when Chi-squared should be used in biology, but the way you can tell normally is: It uses frequency. Correlation coefficient questions will typically use numbers that aren't frequencies.
thanks a lot
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