1. Find the value of z when o = 0.20. O./2 Round your answer to the nearest hundredths. Answer =2. Find the value of z when o = 0.05. 1- 0/2 Round your answer to the nearest hundredths. Answer =3. A random sample of size 40 is selected from a large population with unknown mean and known standard deviation 3.4. What is the left endpoint of a 98% confidence interval for the population mean if the sample mean is 16.2? Round your answer to the nearest hundredths. Answer =4. Suppose a large population has an unknown mean J and a known standard deviation O = 4.8. How many individuals should be randomly sampled from this population so that the sample mean is within 0.75 unit of | with 95% confidence? Answer =5. Let T be a random variable that follows the Students t-distribution with 17 degrees of freedom. Use the t-chart to approximate P(T