Watch the below Tedx video which tells the story of how tap dancing is a part of American history. Summarize in 100 words or less, using key points from the video, and explain why tap dancing is the story of America.
( I can't send the type the link cause it says it's bad words even though it's not so I'll just give the title: "Tap Dancing is the Story of America: Steve Zee at TEDxSoCal")

In a study of a weight loss program, 40 subjects lost a mean of 3.0 lb after 12 months. does the weight loss program have practical significance? a. yes, because the weight loss program worked and the subjects lost a mean of 3.0 lb. b. no, because the mean weight loss of 3.0 lb after one year does not seem to justify the program. c. no, because the sample of 40 subjects was too small to determine if the program was useful. d. yes, because the mean weight loss of 3.0 lb after one year does seems to justify the program.