A nutrition expert claims that the average American is overweight. To test his claim, a random sample of 20 Americans was selected, and the difference between each person's actual weight and idea weight was calculated. For this data, we have xˉ =16 and s=24.1. Is there sufficient evidence to conclude that the expert's claim is true? Carry out a hypothesis test at a 8% significance level.
A. The value of the standardized test statistic: ____