The weights of 69 randomly selected axles were found to have a variance of 2.46. construct the 99%confidence interval for the population variance of the weights of all axles in this factory. round your answers to two decimal places. answer(how to enter)2 points

(1.64,4.01)

Step-by-step explanation:

The confidence interval  for the population variance is given by :-

Given : n= 69 ;

Significance level :

Using Chi-square distribution table ,

   [by using chi-square distribution table]

Now, the 95% confidence interval for the standard deviation of the height of students at UH is given by :-

Hence, the  99% confidence interval for the population variance of the weights of all axles in this factory is (1.64,4.01).

  about 5.6 days

step-by-step explanation:

we can fill the given information into the decay equation and solve for the value of t at which half the sample remains.

the half-life is about 5.6 days.