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3.       a.         A sample of 38 students from a community college reveals the average number of units...

3.      

a.         A sample of 38 students from a community college reveals the average number of units they are taking is 11.5, with a standard deviation of 1.4. Determine a 98% confidence interval for the true mean.

          b.         Assume now that the same results occurred from a sample of size 9, but it was known that the original population was normal.

          c.          Repeat problem 3a, assuming that the standard deviation was the real population standard deviation.

Math   Statistics-And-Probability   
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