If a sample of n = 30 people is selected and the sample correlation between two variables is r = 0.468, what is the test statistic value for testing whether the true population correlation coefficient is equal to zero?

	a.	About t = 2.80.
	b.	About t = -.3.01.
	c.	t = 2.0484.
	d.	Can't be determined without knowing the level of significance for the test.