Qualification > Sciences

A question regarding t-test and chi-squared test

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poisonedrose:
We usually take 0.05/5% as being the critical one.
To calculate the degrees of freedom, simply calculate the (number of classes of data-1)
So if you have 19 classes of data/19 possible sets of phenotype, then the degrees of freedom in this case would be 18.

MKh:
ohhh thnk u dear and what is classes of data??

poisonedrose:
Classes of data are basically the number of phenotypes or the number of data sets you have.
Like, for example if your experiment is the difference between the reaction time of females and males, the number of classes of data is 2. So the degrees of freedom, in this case, would be one.

If you took purple strems, cut leaves: purple stems,potato leaves: green stems,cut leaves: green stems,potato leaves( like you would for a dihybrid cross), then there are four classes of data. So the degrees of freedom is 3.  =)

MKh:
ohh thnk u sooo much!

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