After students were not doing so well in her history class, Mrs. Fields decided to try a different approach and use verbal positive reinforcement at least once every hour. Use the following results to find a 95%95% confidence interval for the true mean change in the students’ test scores after Mrs. Fields 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
1 64 81
2 62 70
3 62 76
4 64 77
5 65 68
6 66 68