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Chapter 8: Q 8.33 (page 330)
What is meant by saying that a statistical procedure is robust?
It means that procedure is working reasonably well.
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Green Sea Urchins. From the paper "Effects of Chronic Nitrate Exposure on Gonad Growth in Green Sea Urchin Strongylocen. trouts drocbachiensis" (A quaculture, Vol. 242, No. 1-4, pp. 357-363) by Siikavuopio et al., the weights, of adult green sea urchins are normally distributed with mean and standard deviation For samples of such weights, identify the distribution of each of the following variables.
a.
b.
The margin of error can be determined if you know only the confidence level, population standard deviation, and sample size.
The value of a statistic used to estimate a parameter is called a ______ of the parameter.
Discuss the relationship between the margin of error and the standard error of the mean.
Civilian Labor Force. Consider again the problem of estimating the mean age, , of all people in the civilian labor force. In Example on page 328 , we found that a sample size of 2250 is required to have a margin of error of year and a confidence level. Suppose that, due to financial constraints, the largest sample size possible is 900 . Determine the greatest confidence level, given that the margin of error is to be kept at half year. Recall that years.
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