A random sample of 25 male students at a university was taken to estimate the average height of all 20,000 male students. The sample average = 69" & sample SD = 2.4". The men follow the normal curve. Compare a 80% CI using SE_avg and z* to a 80% CI using SE⁺_avg and t*.

Using Z:

a. SE_avg =

b. z* for 80% CI =

c. 80% CI = (______ " to ______ ")