A Medical Researcher Is Interested in How Weight Gain in Children

question 39

Multiple Choice

A medical researcher is interested in how weight gain in children from third-world countries is affected by the source of protein (fish,roots and tubers,or nuts and oilseeds) and by level of protein intake (low,defined as less than 0.56 grams per kilogram of weight,or high) .The researcher wants to test the relative efficacy of each protein source,controlling for the level of protein intake but not testing it as the main variable of interest.For this purpose,she classifies a group of children in an impoverished village in a third-world country into either high or low protein intake.Then,the researcher randomly assigns 50 children from each category to a group where the children will receive food once a day that will emphasize one of the three protein sources.You can assume that the total level of protein intake is not affected (it's effects take a longer time to show and depend largely on the other meals the children have at home) .The researcher's experimental design is a ______.

• A) normalized block design
• B) completely randomized design
• C) factorial design
• D) random block design
• E) partially randomized design

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Definitions:

Type II Error

The error that occurs when a false null hypothesis is not rejected, also known as a "false negative."

Type II Error

The error that occurs when a false null hypothesis is not rejected, also known as a "false negative".

Steroids

Steroids are organic compounds with four rings arranged in a specific molecular configuration, used both in medical treatment and illegally to enhance athletic performance.

Type II Error

The error that occurs when a statistical test fails to reject a false null hypothesis, mistakenly indicating that there is no effect or difference when there is.