You may need to use the appropriate appendix table to answer this question. During annual checkups physicians routinely send their patients to medical laboratories to have various tests performed. One such test determines the cholesterol level in patients' blood. However, not all tests are conducted in the same way. To acquire more information, a patient was sent to 10 laboratories and had the cholesterol level measured in each. The results are listed here. Estimate with 95% confidence the variance of these measurements. (Round your answers to two decimal places.) 189 194 186 184 190 196 187 190 193 197 lower bound upper bound