A method produces nanoparticles of various sizes. The diameters of a sample of 60 nanoparticles produced by this method are measured to be 26.3 + 4.5nm Based on this sample, the 96.5% confidence interval for the mean diameter of nanoparticles produced by this method is calculated as: Sample mean + ( zz x o) The samplemean is and o is ***Use only 1 decimal place for answers for example if you get 20.396, use 20.4