Use technology to construct the confidence intervals for the population variance sigmaσsquared2 and the population standard deviation sigmaσ. assume the sample is taken from a normally distributed population. cequals=0.99, sequals=35, nequals=19the confidence interval for the population variance is ( nothing, nothing).

(593.44, 3519.67).

Step-by-step explanation:

As per given , we have

Confidence level :

Significance level :

Sample size : n= 19

Sample standard deviation : s= 35

Using chi-square distribution table , the critical values are:

Now, the Confidence interval for the population variance is given by :-

Hence, the confidence interval for the population variance is (593.44, 3519.67).

use an equation of ratios to determine the amount of gas needed to fill the tank.

    0.2             0.8

  =    

288.75             x

                                                              231 gal

so, 0.2x = (0.8)(288.75 gal), and x = = 1155 gal.

                                                                0.2

it would take 1155 gal. to fill the tank.

the cost would be

1155 gal         $3

* = $3465   (answer)

      1           1 gal

hope this you