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Comparing percentages with different sample sizes

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25 groups with 7 people in each group, join "The Greatest Loser" competition. Based on the greatest percent of weight loss, the greatest loser wins. Calculations regarding percentages are made by taking the total weight of the group and dividing by 7. Weignts are measured initially and after 9 weeks.

A new group comes along and that only has 5 people. Their weights are also measured initially and after 9 weeks. What would be the most accurate methodology for determining the percentage of weight loss for this new group?

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The expert compares percentages with different sample sizes.

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The issue here is that you need to take into account how many people are in the group. If you had a group of 10 people and a group of 20 people, you would expect the second group to lose more weight (overall) than the first ...

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