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Chapter 3: Q 3.59. (page 113)
Why you use the standard deviation as a measure of variation. What is the reference point.
When using the standard deviation as a measure of variation, the mean of the data set serves as the reference point.
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Net worth: The board of Governors of the Federal Reserve system publishes information on family net worth in the survey of consumers fiances. Inthe mean net worth of the families in the united state wasrole="math" localid="1650792936700" thousand and the median net worth wasrole="math" localid="1650792957167" thousand. Which measure of center do you think is more appropriate? Justify your answer.
Although, in practice, sample data are generally analyzed in inferential studies, what is ultimate objectives of such studies ?
Find the
a. Mean b. median c. models
For the mean and the median, round each answer to one more decimal place than that used for the observations.
Hurricanes. An article by D. Schaefer et al. reported on a long-term study of the effects of hurricanes on tropical streams of the Luquillo Experinental Forest in Puerto Rico. The study shows that Hurricane Hugo had a significant impact on stream water chemistry. The following table shows a sample of ammonia fluxes in the first year after Hugo. Data are in kilograms per hectare per year.
We have provided simple data sets for you to practice finding the descriptive measures discussed in this section. For each data set.
Obtain the quartiles, determine the inter quartile range, find the five-number summary.
The Etruscans. Anthropologists are still trying to unravel the mystery of the origins of the Etruscan empire, a highly advanced Italic civilization formed around the eighth century B.C. in central Italy. Were they native to the Italian peninsula or, as many aspects of their civilization suggest, did they migrate from the East by land or sea? The maximum head breadth, in millimeters, of modern Italian male skulls and that of preserved Etruscan male skulls were analyzed to help researchers decide whether the Etruscans were native to Italy. The resulting data can be found on the WeissStats site. [SOURCE: N. Barnicot and D. Brothwell, "The Evaluation of Metrical Data in the Comparison of Ancient and Modern Bones." In Medical Biology and Etruscan Origins, G. Wolstenholme and C. O'Connor, cds., Littlc, Brown \& Co., ]
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