SHOW WORK TO GET FULL CREDIT Problem 4) (Note that a) and b) are separate problems) a) (6 points) An educator believes that a new activity brought into the class will aid in the students' understanding of the subject matter A control class of 22 students used the same curriculum. An experimental class of 20 students were introduced to the activity. At the end of an 8-week period, they both wrote a test, and the scores are summarized below. Group n X-bar S Treatment 20 51.48 11.01 Control 22 41.52 17.15 Assuming Normality and equal variance, what is a 90% confidence interval for the difference in means? SHOW WORK. Round your answers to 4 decimal places