Chapter 1 - Introduction to Statistics - 1-2 Statistical and Critical Thinking - Page 12: 13

It is not statistically significant, but is practically significant.

This is because there is a 30 percent chance of getting such results with a diet, which has no effect. 30 percent is too large to be statistically significant. However, the average loss of 45 pounds is practically significant because the difference is large enough in a practical sense,