Biology Homework Solutions
Problem
#13927

Which statistical test should I use?

Im working on an experiment for my A level course (UK) that will determine the effects of different respiratory substrates on yeast population growth.  Im using 4 sugars; fructose, glucose, sucrose and lactose.  Using a haemocytometer I'll find the size of the yeast population before the sugar is added and the growth 1 week after.  
I have a choice of 3 statistical tests to choose from: the standard error test; the chi-squared test; and the Mann-Whitney U test.  The standard error seems to be the best one to me, but i thought it could only be used for large samples ( at least above 10)?

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