SOLUTION: An article in the San Jose Mercury News stated that students in the California state university system take 4.8 years, on average with a standard deviation of 1.9, to finish their

Question 1187782: An article in the San Jose Mercury News stated that students in the California state university system take 4.8 years, on average with a standard deviation of 1.9, to finish their undergraduate degrees. Suppose you believe that the mean time is longer.
You conduct a survey of 72 students and find they have a mean of 5.5 and a standard deviation of 1.8.
What would be your standard error of the mean (SEM)? Please compute to 4 decimal places.
Answer by Boreal(15235) (Show Source): You can put this solution on YOUR website!
SEM is sd/sqrt(n)=1.9/sqrt(72), or 0.2239 years. We know the population sd, so we use that to calculate the SEM of the sample. If we didn't know that, we would have to use the one estimate we have, 1.8 years, from the sample.
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