An auto manufacturing company wants to estimate the variance of miles per gallon for its auto model AST72. A random sample of 24 cars of this model showed that the standard deviation of miles per gallon is 0.58. Assume that the miles per gallon for all such cars (approximately) normally distributed. The 98% confidence interval for the population variance is:

Select one:

a.

0.1858 - 0.7588

b.

0.4310 - 0.8711

c.

0.3204 - 1.3084

d.

0.5660 - 1.1439