Join for Free!
121436 members

HELP PLEASE! Statistical application for biology experiment!

Discussion of the distribution and abundance of living organisms and how these properties are affected by interactions between the organisms and their environment

Moderator: BioTeam

HELP PLEASE! Statistical application for biology experiment!

Postby doraemon » Mon May 05, 2008 8:13 am

I am carrying out an experiment on Helice Crassa/tunnelling mud crab, observing how changes in salinity affect the number of aggressive interactions between individuals, and have come to the point where I need to include some statistical analysis, I have found several choices but I don't know which is relevant and which I should use!!!
Standard Deviation
Normal Distribution
The X^2 Test
These are afew.. I have already calculated the standard deviation but I am not sure if its relevant to my research... Please help, anything is appreciated asap.
Posts: 1
Joined: Mon May 05, 2008 8:07 am

Re: HELP PLEASE! Statistical application for biology experiment!

Postby blcr11 » Mon May 05, 2008 1:14 pm

If you only have one level of salinity to compare, i.e. only two groups, one a control and the other the experiment, then you only need to do a t-test. If you have more than one level of salinity to compare to the control, then you can do sequential t-tests, but ANOVA is designed for these kinds of cases. Chi-squared tests are goodness-of-fit statistics, which I suspect is probably not what you want.
Posts: 672
Joined: Fri Mar 30, 2007 4:23 am

Postby canalon » Tue May 06, 2008 2:28 pm

and before applying T-test or ANOVA, it is indeed good to test for normality. And if you have a non normal distribution you will have to use non parametric tests like U-test

Science has proof without any certainty. Creationists have certainty without
any proof. (Ashley Montague)
User avatar
Inland Taipan
Inland Taipan
Posts: 3909
Joined: Thu Feb 03, 2005 2:46 pm
Location: Canada

Return to Ecology

Who is online

Users browsing this forum: No registered users and 0 guests