An effective way to tap rubber is to cut a panel in the rubber tree's bark in vertical spirals. In a pilot process, an engineer measures teh output of latex from such cuts. Eight cuts on different trees produced latex (in liters) in a week:
| 26.8 | 32.5 | 29.7 | 24.6 | 31.5 | 39.8 | 26.5 | 19.9 |
Construct a 95% confidence interval for the variance of the yield.
The statistical software output for this problem is :
One sample variance confidence interval:
σ2 : Variance of variable
95% confidence interval results:
| Variable | Sample Var. | DF | L. Limit | U. Limit |
|---|---|---|---|---|
| Data | 35.546964 | 7 | 15.5394 | 147.24734 |
A 95% confidence interval for the variance of the yield is :
(15.5 , 147.2)
An effective way to tap rubber is to cut a panel in the rubber tree's bark...