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A sample of 81 CCA students show that the average age of CCA students is x¯...

A sample of 81 CCA students show that the average age of CCA students is x¯ =24.5 years, with a standard deviation of ss = 8 years.


1. Compute the z-score for a student who is x= 31.53 years old.

z-score=

2. Interpret the z-score from part 1.

3. Using the mean and standard deviation from above, construct a 80 % confidence interval for the average age of all CCA students.
Lower Bound =
Upper Bound =
4. If you decided to change the confidence level in #3 to 98 %. The margin of error will

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