10.3. Testing One Variance http://www.ck12.org
7.
X^2 =
dfs^2
σ^2= ( 29 × 1. 12 )/ 3. 22 = 10. 90
- Failure to Reject the Null Hypothesis since 3. 22 ≤ 10 .90. We cannot conclude that the sample comes from
the larger population with respect to variance. - Between 0.82 and 1. 98
dfs^2
42. 56≤σ^2 ≤
dfs^2
17. 71
295. 20
42. 56
≤σ^2 ≤295. 20
17. 71
0. 82 ≤σ^2 ≤ 1. 98- We are 90% confident that the overall population variance(σ^2 )is between 0.82 and 1. 98