An educational psychologist wants to test whether a new teaching method negatively affects reading comprehension scores using a significance level of 0.10. A sample of 15 students taught with the new method has a mean reading comprehension score of 75.2. The population of all students taught using the old method has a mean reading comprehension score of 74.4 and a standard deviation of 8.9. Assume scores are distributed normally. What is the value of the upper limit of the 90% Confidence Interval for the mean reading comprhension scores