Help sourcing datasets (.csv)

Dear Sir or Madam
I?m trying to compile a collection of datasets that require use of the following hypothesis tests.
Are there datasets within the R library that I can get access to?
Kind regards
James Carrigan 

Hypothesis Testing
t.test(X,Y) 
? performs a two sample t-test between X and Y 
t.test(X,Y,paired=TRUE) 
? performs a paired t-test between X and Y
prop.test(x = c(a, b), n = c(n1, n2)) 
? performs a 2-sample test for equality of proportions with continuity correction

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