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Z , X + Z ] 2 2 n n 4. Practice a. A random sample of 90 observations produced a mean x = 25.9 and a standard deviation s = 2.7. I. Find a 95%
Z , X + Z ] 2 2 n n 4. Practice a. A random sample of 90 observations produced a mean x = 25.9 and a standard deviation s = 2.7. I. Find a 95% condence interval for . What is the margin of error? Ii. Find a 90% condence interval for . What is the margin of error? Iii. Find a 99% condence interval for . What is the margin of error? B. A random sample of 100 observations from a normally distributed population possesses a mean equal to 83.2 and a standard deviation equal to 6.4. Ii. What does it mean when you say that the condence level is 95%?
