CI (Z) calc 4: A population is normally distributed with a standard deviation of 4.86. A sample of 13 items from the population yield a mean of 26.2. Determine the upper boundary of a 90% Cl. Round to the nearest hundredth QUESTION 5 2 points Save Practice CI (Z) calc 2: A population is normally distributed with a standard deviation of 4.06. A sample of 20 items from the population yield a mean of 26.9. Determine the upper boundary of a 95% Cl. Round to the nearest hundredth QUESTION 6 2 points Save An CI (Z-app) calc 2: A sample of 83 healthy human body temperatures yields a mean of 98.58. The population has a standard deviation of 0.26. Determine the lower boundary of a 98% Cl. Round to the nearest hundredth