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Statistics / The Practice of Statistics 5 / Chapter 4.2 / Problem 79

The Practice of Statistics | 5th Edition | ISBN: 9781464108730 | Authors: Daren S. Starnes, Josh Tabor

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Aw, rats! A nutrition experimenter intends to compare the weight gain of newly weaned

Chapter 4, Problem 79

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QUESTION:

Aw, rats! A nutrition experimenter intends to compare the weight gain of newly weaned male rats fed Diet A with that of rats fed Diet B. To do this, she will feed each diet to 10 rats. She has available 10 rats from one litter and 10 rats from a second litter. Rats in the first litter appear to be slightly healthier. (a) If the 10 rats from Litter 1 were fed Diet A, the effects of genetics and diet would be confounded, and the experiment would be biased. Explain this statement carefully. (b) Describe a better design for this experiment.

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QUESTION:

Aw, rats! A nutrition experimenter intends to compare the weight gain of newly weaned male rats fed Diet A with that of rats fed Diet B. To do this, she will feed each diet to 10 rats. She has available 10 rats from one litter and 10 rats from a second litter. Rats in the first litter appear to be slightly healthier. (a) If the 10 rats from Litter 1 were fed Diet A, the effects of genetics and diet would be confounded, and the experiment would be biased. Explain this statement carefully. (b) Describe a better design for this experiment.

ANSWER:

Step 1 of 4

Given,

Number of rats,

Also said that she has available 10 rats from one litter and 10 rats from a second litter. Rats in the first litter appear to be slightly healthier. So let’s determine the following:

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