
Concept explainers
To classify: the mean as a parameter or a statistic.

Answer to Problem 5CA
Thus mean score 25.3 is a statistic.
Explanation of Solution
Given:
Mean 25.1 and 25.3
Calculation:
A parameter is a numerical description of a population characteristic while a statistic is a numerical description of a sample characteristic.
The population in this case is all the students who took Medical College Admission Test over a period of 3 years.
And the sample is the group of 1000 students who took the exam.
Since here the first mean score 25.1 is based on all students who took Medical College Admission Test, hence it is a population characteristic.
Thus mean score 25.1 is a parameter.
Since the second mean score 25.3 is based on a group of 1000 students who took Medical College Admission Test, hence it is a sample characteristic.
Thus mean score 25.3 is a statistic.
Conclusion:
Thus mean score 25.3 is a statistic.
Chapter 11 Solutions
Big Ideas Math A Bridge To Success Algebra 2: Student Edition 2015
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