Assume you have a t-test for the difference between two means: Ho : M1 /2 - 0 HA : M1 /2 7 0 From a survey, you know that y -99, y -90. and SE ( y - y 2 3.6. After calculating the degree of freedom, you use software to find the corresponding critical value for a 95% confidence interval to be 1.9. Construct the 95% confidence interval for the mean and report the lower limit