Extending the Concepts and Skills 1.23 Ballistic Fingerprinting. In an on-line p

Question

Extending the Concepts and Skills 1.23 Ballistic Fingerprinting. In an on-line press release. ABCNews.com reported that “..·73 percent of Americans favor a law that would require every gun sold in the United States to be test-fired first, so law enforcement would have its fingerprint in case it were ever used in a crime." a. Do you think that the statement in the press release is inferential or descriptive? Can you be sure? b. Actually, ABCNews.com conducted a telephone survey of a ran- dom national sample of 1032 adults and determined that 73% of them favored a law that would require every gun sold in the United States to be test-fired first, so law enforcement would have its fin- gerprint in case it were ever used in a crime. How would you rephrase the statement in the press release to make clear that it is a descriptive statement? an inferential statement?

Explanation / Answer

Question 1.23

Part a

We are sure that the statement in the press release is descriptive because it describes the percentages of population in favour of a law.

Part b

The statement in the given scenario is an inferential statement because news channel infer the percentage of favour population based on the collected sample.

Question 1.25

Part a

The population under consideration is all Americans between the ages of 18 and 29.

Part b

The sample under consideration is the persons selected from the Americans between the ages of 18 and 29.

Part c

The statement in quotes is inferential because percentage of persons who oppose medical testing on animals is determined by using sample data.

Part d

We know that the percentage of persons who oppose medical testing on animals is determined by using sample data; which means we are not 100% sure about the actual percentages and given percentage is used only for inference. Actual figure may be different from the given figure.

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