Derive confidence interval

[hanban89]

Given two normally distributed independent samples y_1,1, …, y_1,n1 and y_2,1, …, y_2,n2 with unknown means µ₁ and µ₂ and unknown variances σ²₁/ σ²₂, derive with all necessary steps a confidence interval for σ²₁/ σ²₂ from the appropriate pivotal value whose distribution must be specified. Let the confidence coefficient be 1 – α and denote the unbiased estimates of σ²₁ and σ²₂ by s²₁ and s²₂, respectively.

 

[Dr_Ochrome]

So what is the question? And Where is your work? If you don't show something we won't be able to help you because it's better to show you where you make a mistake or how you can pursue your method than giving you a well built answer.