Find the 90% confidence interval: for the population standard deviation: given the following.

n = 51, [tex]\frac{}{x}[/tex] = 11.49, s = 2.34 and the distribution is: normal.

1.92 < σ < 3.25
2.01 < σ < 2.81
1.37 < σ < 1.91
10.28 < σ < 14.32

Show work. Ignore the colons.