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Chapter 1: Q 1.28. (page 15)
Identify two statistical methods other than a census for obtaining information.
Experimentation and Sampling are the two statistical methods other than a census for obtaining information.
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Element Hunters. In the article "Element Hunters" (National Geographic, Vol. 233, No. 5, pp. 112-120), R. Dunn reports about the search for new undiscovered elements. Since 1940, scientists have been synthesizing elements one by one. The first was neptunium (Np), element number 93. There are, as of this writing, a total of 26 new synthetic elements. The following table provides their element numbers and symbols.
(a) Suppose that you decide to take a simple random sample of eight of these new elements. Use Table I in Appendix A to obtain eight random numbers that you can use to specify your sample.
(b) If you have access to a random-number generator, use it to solve part (a).
Regarding observational studies and designed experiments:
(a) Describe each type of statistical study.
(b) With respect to possible conclusions, what important difference exists between these two types of statistical studies?
Explain two ways in which descriptive statistics and inferential statistics are interrelated.
Explain why a census is often not the best way to obtain information about a population.
The members of a population are numbered 1-50.
(a). Use Table I in Appendix A to obtain an SRS of size 6 from the population. Start at the two-digit number in line number 10 and column numbers 10-11, read down the column, up the next, and so on.
(b). If you have access to a random-number generator, use it to solve part (a)
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