Please answer this with explanation so I can understand it clearly. Thankyou.

Common Levels of Confidence . Commonly used confidence levels are 90%, 95%, and 99% Confidence Confidence Coefficient, z value, Level 1-a 80% 80 1.28 90% .90 1.645 95% .95 1.96 98% 98 2.33 99% 99 2.57 99.8% 998 3.08 99.9% .999 3.27 A random sample of 30 items is selected from a population with a standard deviation of 10. If the sample mean is 52. the 90% confidence interval to estimate the population mean is? * Your answer A random sample of 20 items is selected from a population. The sample yields a mean of 22.8 and a standard deviation is 3.4. Determine a 95% confidence interval for the population mean. * Your