statistics
posted by Chloe .
DO I NEED TO USE 2TAILED OR 2TAILED RESULTS? WHY?
A researcher believed that 2 hours per week of intensive exercise would result in significant weight loss after 12 weeks on the schedule. Accordingly, he weighed a group of 50 subjects before and after the 12 week exercise period.

I would use a one tailed result. http://en.wikipedia.org/wiki/One_and_twotailed_tests

Rawr