Which one of the following instructions to the research subject will provide the highest possible level of measurement?
a. Indicate whether your income is above $20,000 a year or not.
b. What was your income last year: $0–$20,000; $20,000–$60,000; $60,000–$100,000; or more than $100,000?
c. What was your total income last year, before taxes? Enter amount: _____
d. Did you earn money last year?
ANS: C
An important rule of measurement is that one should use the highest level of measurement possible. For example, you can collect data on age (measured) in a variety of ways: (1) you can obtain the actual age of each subject (ratio level of measurement); (2) you can ask subjects to indicate their age by selecting from a group of categories, such as 20–29, 30–39, and so on (ordinal level of measurement); or (3) you can sort subjects into two categories of under 65 years of age and 65 years of age and older (nominal level of measurement).
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The adverse effects of anthelmintic drugs include ________.
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