8. Chapter 9, Problem 9.1 Aa Aa In each situation, explain whether the value giv

Question

8. Chapter 9, Problem 9.1 Aa Aa In each situation, explain whether the value given in bold print is a statistic or a parameter: Statistic Parameter A writer wants to know how many typing mistakes there are in his manuscript, so he hires a proofreader, who reads the entire manuscript and finds 15 errors. For a sample of 20 men and 25 women, there is a 14-cm difference in the mean heights of the men and women. A polling organization samples 1,000 adults nationwide and finds that 72% of those sampled favor tougher penalties for persons convicted of drunk driving. In the year 2000 census, the U.S. Census Bureau found that the median age of all American citizens was about 35 years.

Explanation / Answer

A number is a statistic is it repesents a sample and parameter if it represents a population

1) 15 errors - Parameter (because the proof reader went through the entire book and hence it 15 errors is of the population)

2) 14 cm - Statistic (The data is taken from a sample)

3) 72% - Statistic (The data is taken from a sample of 1000)

4) 35 years - Parameter (Census is a population study)

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