2 points Practice CI (t) calc: A population is normally distributed. A sample of 2 items from the population yield a mean of 74.6 and a standard deviation of 17.11. Determine the upper boundary of a 99% Cl. Round to the nearest hundredth QUESTION 2 2 points CI (Z) calc 2: A population is normally distributed with a standard deviation of 2.84. A sample of 16 items from the population yield a mean of 26.9. Determine the upper boundary of a 90% Cl. Round to the nearest hundredth QUESTION 3 2 points S Practice z-alpha notation: Suppose that a confidence interval is to use 63.4% confidence. What is the value of alpha/2? No rounding Click Save and Submit to save and submit. Click Save All Answers to save all answers