Suppose the fat content of a hotdog follows normal distribution.Ten random measurements give a mean of 21.77 and standard deviation of 3.69. The 90% confidence interval for the population variance of fat content of a hotdog is ________
A) 5.2 to 21.3
B) 7.3 to 36.9
C) 19.63 to 23.91
D) 19.85 to 23.69
E) 2.69 to 5.1

Question

Quizplus · Accepted Answer

The confidence interval for the population variance is calculated using the chi-square distribution. With 9 degrees of freedom (n-1), the interval is found using the sample variance and chi-square critical values.

Suppose the Fat Content of a Hotdog Follows Normal Distribution