Shell Rotella T6 is a synthetic 5W-40 engine oil, where 40 is the oil weight ...

      Shell Rotella T6 is a synthetic 5W-40 engine oil, where   40 is the oil weight. SAE specifies that 40 weight oil have a viscosity   between 12.5 and 16.3 cSt. An unopened barrel of T6 was sampled with n = 36   and the viscosity measured. The results are provided in the Oil   dataset on Canvas. Use Excel or (or any means you like) to find:   Viscosity a. The sample   mean (x̅) and standard deviation (s)   13.07 b. The 95   percent CI for µ   12.45 c. The 95   percent CI for σ2   12.52    14.29    12.36    13.74    12.83    13.15    12.6    12.58    13.09    12.81    12.68    12.6    13.97    12.76    12.81    12.17    12.28    12.52    14.35    13.58    12.07    12.87    12.77    12.55    12.33    12.63    12.5    12.36    12.65    12.67    13.53    12.81    12.82    13.39