A researcher found that 15 students who regularly consume 1/1 marijuana had a mean GPA of 2.3 and 37 students who do not regularly consume marijuana had a mean GPA of 2.7. The 95% confidence interval around the difference between the two sample means was 0.4 + 2.009(.2774) = [-0.96, 0.16]. Use this information to determine t,,s. Please enter your answer correctly rounded to at least 2 decimal places. fobs =