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# doing math studies ia..whats t-test / chi-square?! watch

1. K, i m doing my ia and apparently you get more points if you do the t-test / chi-square! but i havent learnt this in class before,
may someone pls explain what it is ? and how would you use it?
and in what circumstances could you use it?
THANKS A LOT.
will appreicate it a lot!
2. t-test is you use a hypothesis test to test a group of data that follows t-distribution
you use it when the stadard deviation is unknown. the formula is t= (sample mean - population mean)/(sample deviation/square root of sample size) where the degree of freedom is sample size - 1
Chi-square test is testing the significance difference between the observed values against the expected values of a certain distribution
3. thanks so much! but how would you do chi-qaure!?
4. If you're doing maths studies, the method of doing it should be in your textbook. You'll need a calculator that can evaluate numbers put into matrices - because you can't do it by hand (well ... you could try, but it would take some time). You'll also need to read up on the different levels that you can test at (1%, 5%, 10% for example) and what their effect has on the numbers you're calculating. This is a pretty important part of your maths studies IA - not only to discuss the differences between samples, but also their significance.

Good luck!

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Updated: July 27, 2009
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