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The South Beach diet was given to a volunteer group of 25 people who were at least 50 pounds overweight. 18 people from the group lost at least 20 pounds. What should we conclude about the effectiveness of the diet?

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Neuron
Judging from your question we could conclude that the South Beach diet was an effective tool of reducing weight in the group of these volunteers. It would however be important to see how this group would compare to a group of people which wouldn't have been put on any diet to see the natural fluctuation of weight.
Thank you for posting your question here at brainly. I hope the answer will help you.  The The diet is effective in 72% of people. Below is the solution:

The diet was effective for 18 out of 25 people right
there fore 18/ 25  = .72
to convert is should be 72% 

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