Suppose we want to study contaminated ?sh in a river. It is important for the study to know the size of the variance σ2 in the ?sh weights. The 25 samples of ?sh in the study produced the following summary statistics: x = 1030.5 g, and the standard deviation s = 200.6 g. Construct a 95% con?dence interval for the true variation in weights of contaminated ?sh in this river.