Which is not a critical part of designing a good experiment?
A) Random selection of subjects.
B) Replication of the on a sufficient number of subjects.
C) Control of known sources of variability.
D) All of these are important.
E) Random assignment of subjects to treatments.
Question 2
Hoping to get information that would allow them to negotiate new rates with their advertisers, Natural Health magazine phoned a random sample of 600 subscribers. 64 of those polled said they use nutritional supplements. Which is true?
I. The population of interest is the people who read this magazine.
II. 64 is not a statistic; it's the parameter of interest.
III. This sampling design should provide the company with a reasonably accurate estimate of the percentage of all subscribers who use supplements.
A) I only
B) I, II, and III
C) I and III only
D) II and III only
E) I and II only
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part b