6/20 Question 4 of 10, Step 1 of 1 Correct After students were not doing so well in her math class, Mrs. Stevens decided to try a different approach and use verbal positive reinforcement at least once every hour. Use the following results to find a 95 % confidence interval for the true mean change in the students' test scores after Mrs. Stevens started using positive reinforcement. Assume that the population distribution of the paired differences is approximately normally distributed. Round to one decimal place. Students' Test Scores Student Without Reinforcement With Reinforcement 56 70 89 N 70 3 53 66 73 77 48 UT 44 6 54 69 Tables Ke