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Chapter 1: The Nature of Statistics

Q 1.24.

Page 9

Causes of Death. The National Center for Health Statistics published the following data on the leading causes of death in 2010 in National Vital Statistics Reports. Deaths are classified according to the tenth revision of the International Classification of Diseases.

Rates are per 100,000 population.

Q 1.25.

Page 9

Medical Testing on Animals. In its Summer 2013 Animal Action Report, the National Anti-Vivisection Society stated that "59% of Americans between the ages of 18 and 29 oppose medical testing on animals." The percentage of 59% was computed from sample data.

(a). Identify the population under consideration.

(b). Identify the sample under consideration.

(c). Is the statement in quotes descriptive or inferential?

(d). If you wanted to make it clear that the percentage of 59% was computed from sample data, how would you rephrase the statement in quotes?

Q 1.27.

Page 15

Explain why a census is often not the best way to obtain information about a population.

Q 1.28.

Page 15

Identify two statistical methods other than a census for obtaining information.

Q 1.29.

Page 15

In sampling, explain why obtaining a representative sample is important.

Q 1.31.

Page 15

Regarding probability sampling:

(a) What is it?

(b) Does probability sampling always yield a representative sample?

(c) Identify some advantages of probability sampling.

Q 1.32.

Page 15

Regarding simple random sampling:

(a) What is simple random sampling?

(b) What is a simple random sample?

(c) Identify two forms of simple random sampling and explain the difference between the two.

Q 1.35.

Page 15

What is the acronym used for simple random sampling without replacement?

Q 1.36.

Page 15

The members of a population are numbered 1-5.

(a) List the 10 possible samples (without replacement) of size 3 from this population.

(b) SRS of size 3 is taken from the population, what are the chances of selecting 1, 3, and 5? Explain your answer.

(c) Use Table I in Appendix A to obtain an SRS of size 3 from the population. Start at the single-digit number in line number 5 and column number 20, read down the column, up the next, and so on.

Q 1.37.

Page 15

The members of a population are numbered 1-4.

(a). List the 6 possible samples (without replacement) of size 2 from this population.

(b). If an SRS of size 2 is taken from the population, what are the chances of selecting 2 and 3? Explain your answer.

(c). Use Table I in Appendix A to obtain an SRS of size 2 from the population. Start at the single-digit number in line number 17 and column number 7, read down the column, up the next, and so on.

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