The following data show the results from an independent-measures study comparing two treatments.

Question: Question: The following data show the results from an independent-measures study comparing two treatments.

a.	Compute the independent-measures t statistic for these data.
b.	Compute the percentage of variance explained by the treatment effect (r²).
c.	Convert the data into a form suitable for calculating the point-biserial correlation, and compute the correlation. (You should find that squaring the point-biserial correlation will produce the same r² value that you obtained in part b.)

	Treatment
	I	II
	1	4
	6	11
	6	10
	3	7
	M = 4	M = 8
	SS = 18	SS = 30