The scores that follow were obtained before and after a Tai-Chi workshop. Higher scores indicate a greater calmness. Identify the design, find d and calculate a 99% confidence interval. Write a conclusion telling what your analysis shows.

Participant Before After

J. U. 4 7

S. T. 3 5

A. S. 7 9

M. I. 2 4

L. E. 6 7