The thicknesses of 67 randomly selected stainless steel sheets were found to have a variance of 3.75. Construct the 98% confidence interval for the population variance of the thicknesses of all stainless steel sheets in this factory. Round your answers to two decimal places.

The 98% CI for the variance is

Step-by-step explanation:

We have a sample of size n=67.

The sample variance is 3.75.

We want to construct a 98% confidence interval.

The degrees of freedom are N-1=66.

We can write the 98% confidence interval as:

We calculate (n-1)s^2 as:

The values for the chi-square for both extremes of the 98% CI are:

Then, we replace the values in the CI

the transverse axis of a hyperbola is the line that contains the two vertices and the two focuses.

in this example (hyperbola of equation x^2/2 - y^2/4 = 1), the transverse axis is the  x-axis  . 

step-by-step explanation:

i believe that the answer is

b. y-1=-2(x-4)

hope this !