Today 6:29 PM O Edit All Photos Extra Credit [5 points] A physical therapist evaluated an experimental program for recovery from knee replacements. He selected a random sample of patients who just had knee replacements and used the experimental program for their therapy. He measured each patient's flexion angle (bending capability in degrees) of the knee. He calculated the mean flexion angle for the sample: - 80 degrees. Using a two-tailed significance test, he rejected Ho: ( = 90 using the usual decision cutoff of a = 0.05. Which one of the following could be a 95% confidence interval for the mean flexion angle for all patients receiving the experimental program as their therapy? Show your reasoning. No credit for just giving the correct interval - be sure to briefly explain your reasoning. a) (100, 120 degrees) b) (76, 90 degrees) c) (80, 100 degrees) d) (75, 85 degrees) e(75, 95 degrees)