11-36. A machine designed to dispense a specific amount of soap powder had a sample variance of s2 1

= 0.714 for n1 = 17 fills. A similar machine was tested for n2 = 25 fills and it was determined that s2 2

= 0.438. (Assume the fill amounts for these machines are approximately normally distributed.)

Find a 95% confidence interval for σ2 1 /σ2 2 .