A Sample of Size 20 Is Used to Obtain the Following

Short Answer

A sample of size 20 is used to obtain the following statistics: $\sum x _ { i } = 4363$ and $\Sigma \mathrm { x } _ { i } ^ { 2 } = 953,180$ Estimate the population variance with 98% confidence.
Lower value = ____________________
Upper value = ____________________