A population is normally distributed. A sample of 25 items from the population yield a mean of 21.6 and a standard deviation of 3.14. Determine the upper boundary of a 95% Cl. Round to the nearest hundredth QUESTION 8 2 points Sav CI (Z) calc 3: A population is normally distributed with a standard deviation of 2.76. A sample of 10 items from the population yield a mean of 25.0. Determine the upper boundary of a 95% CI. Round to the nearest hundredth QUESTION 9 2 points Save Ar margin error 01: A sample of 52 healthy human body temperatures yields a sample average of 98.55 degrees F. If the population is known to be normal with a standard deviation of 0.23 degrees F, determine the margin of error of a 95% confidence interval. Round to the nearest thousandth, such as "0.024 degrees F"