Find the 95% Confidence Interval for the Variance of the Heights

Multiple Choice

Find the 95% confidence interval for the variance of the heights of maple trees if a sample of 11 trees has a standard deviation of 10.2 feet.

A) $93.0 < \sigma ^ { 2 } < 115.0$
B) $7.1 < \sigma ^ { 2 } < 17.9$
C) $9.2 < \sigma ^ { 2 } < 11.2$
D) $50.8 < \sigma ^ { 2 } < 320.4$