[R] How to test for the difference of means in population, please help

[ali_protocol]

Dear all,

Novice in statistics.

I have 2 experimental conditions. Each condition has ~400 points as its
response. Each condition is done in 4 repereats (so I have 2 x 400 x 4
points). 

I want to compare the means of two conditions and test whether they are same
or not. Which test should I use?

#populations
c = matrix (sample (1:20,1600, replace= TRUE), 400 ,4)
b = matrix (sample (1:20,1600, replace= TRUE), 400 ,4)

#means of repeats
c.mean= apply (c,2, mean)
b.mean= apply (b,2,mean)

#mean of experiment
c.mean.all= mean (c)
b.mean.all= mean (b)

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