Pls help me understand how to solve this math question. The book isn't helping. Thx?

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Jesacutie

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A diet doctor claims that the average North American is more than 20 pounds overweight. To test his claim, a random sample of 20 North American’s are weighed, and the difference between their actual weight and their ideal weight was calculated. The data are listed here. Do these data allow us to infer at the 5% significance level that the doctor claim is true?
16 23 18 41 22 18 23 19 22 15 18 35 16 15 17 19 23 15 16 26
 
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