def signtest_data(RNG,n,trend=0):
	"""
		Creates a dataset of `n` pairs of normally distributed numbers with a trend towards the first half of a pair containing smaller values.
		If `trend` is zero, this conforms with the null hypothesis.
	"""
	return [(
			RNG.normal(size=size)-trend,
			RNG.normal(size=size)
		) for size in RNG.randint(15,21,size=n) ]