As part of an effort to develop new battery technologies, constant-use life spans of twenty cell phone batteries were measured (below in hours). Use these values to address 4. the following question...

Extracted text: As part of an effort to develop new battery technologies, constant-use life spans of twenty cell phone batteries were measured (below in hours). Use these values to address 4. the following question 15.7. 14.6. 15.6. 14.5. 15.2. 16.0. 15.0. 15.7. 16.2. 14.7, 15.3. 16.0, 14.4, 16.2, 16.2. 14.9, 14.8. 15.7, 15.3, 14.6 a. b, c. Do the data appear to be consistent with a normal distribution? what is the 95% CI on the mean? What is the 95% CI on the variance?