FORESTRY
AGRICULTURAL STATISTICS AND ECONOMICS
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Is diet or exercise effective in combating insomnia? Some believe that cutting out desserts can help alleviate the problem, while others recommend exercise. Forty volunteers suffering from insomnia agreed to participate in a month-long experiment. Half were randomly assigned to a special no-desserts diet; the others continued desserts as usual. Half of the people in each of these groups were randomly assigned to an exercise program, while the others did not exercise. Those who ate no desserts and engaged in exercise showed the most improvement. Which of the following best describes the inferences the researcher can make based on his results?
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He can make inferences about cause and effect, but not about the population from which the samples where taken.
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He can make inferences about cause and effect and about the population from which the samples where taken.
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He cannot make inferences about cause and effect or about the population from which the samples where taken.
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He can make inferences about the population from which the sample was taken, but not about cause and effect.
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Explanation:
There is 1 question to complete.