1. ## Two Population Variances help please

This has been giving me fits for over an hour now and I can't understand what I'm doing wrong.

"In constructing a 90% interval estimate for the ratio of two population variances, σ1^2/σ2^2, two independent samples of sizes n1 = 41 and n2 = 61 are drawn from the populations. If the sample variances are s12 = 515 and s22 = 920, then the upper confidence limit is:"

So it's asking for the upper limit. The formula should be (s1^2/s2^2) Fd2,df1

So I did 920/515 for the sample variances since 920 is the bigger variance it goes on the numerator. My degrees of freedom should be df1 = 40, df2= 60. I looked it up in my F table at the alpha level of 5% and the value is 1.59. Multiply that with the 920/515 to get the answer but this isn't correct. No idea what's wrong.

2. ## Re: Two Population Variances help please

Do you know what the answer should be?

3. ## Re: Two Population Variances help please

.245
.341
.890
.352
.918

Its not .341 or. 890 as ive already tried them

4. ## Re: Two Population Variances help please

I've got like an hour left to turn this in can someone please help me, it can't be that difficult

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