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Chapter 1: Q2-5BSC (page 1)

Identify whether the given value is a statistic or a parameter.

In a study of American Airlines flights from JFK in New York to LAX in Los Angeles, 48 flights are randomly selected and the average (mean) arrival time is 8.9 minutes late.

Short Answer

Expert verified

The average (mean) arrival time, equal to 8.9 minutes late, for the randomly selected 48 flights is a statistic.

Step by step solution

01

Given information

A random sample of 48 adults is extracted from the population of a large number of American Airlines flights taking off from New York and landing in Los Angeles.

02

Statistic and parameter

A statistical quantity calculated from the sample is called astatistic. For example, mean, proportion, and standard deviation are calculated using the sample.

A statistical quantity calculated from the population is called a population parameter or simply a parameter. For example, mean, range and variance are calculated for the population.

03

Identification of a statistic or a parameter

As the average (mean) arrival time is computed for a sample of 48 flights, the average (mean) arrival time equal to 8.9 minutes late is a statistic.

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Most popular questions from this chapter

In Exercises 21–24, refer to the data in the table below. The entries are white blood cell counts (1000 cells,ML) and red blood cell counts (million cells,ML) from male subjects examined as part of a large health study conducted by the National Center for Health Statistics. The data are matched, so that the first subject has a white blood cell count of 8.7 and a red blood cell count of 4.91, and so on.

Conclusion: If we analyze the sample data and conclude that there is a correlation between white blood cell counts and red blood cell counts, does it follow that higher white blood cell counts are the cause of higher red blood cell counts?

Statistical Significance and Practical Significance. In Exercises 13–16, determine whether the results appear to have statistical significance, and also determine whether the results appear to have practical significance.

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In Exercises 17–20, refer to the sample of body temperatures (degrees Fahrenheit) in the table below. (The body temperatures are from a data set in Appendix B.)

Subject


12345
8 AM9798.597.697.798.7
12 AM97.697.89898.498.4

Source: The listed body temperatures were obtained from Dr. Steven Wasserman, Dr. Philip Mackowiak, and Dr. Myron Levine, who were researchers at the University of Maryland. Is the source of the data likely to be biased?

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Context of the Data: Refer to the table of body temperatures. Is there some meaningful way in which each body temperature recorded at 8 AM is matched with the 12 AM temperature?
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