A Statistician Measures the Difference in Songbird Warble Variation in 25

question 12

Multiple Choice

A statistician measures the difference in songbird warble variation in 25 mockingbirds, both before and after nutritional supplementation with Dr. Petit Oiseau's Musical Bird Seed. Warble variation is determined by a computer program that detects sound frequency and pattern changes during a 15-minute period twice a day, and these data are averaged to represent number of warble variations per minute. What considerations determine choice of a test for this research?

• A)The sample size is small to moderate.
• B)There is one group of birds and all receive the treatment.
• C)A before-after type of design is used.
• D)The independent variable is at the nominal level.
• E)Birds are divided into two groups.
• F)The independent variable is ratio level.
• G)The dependent variable is ratio level.

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