You Are Evaluating Investing in a Cognitive Training Company

question 94

Multiple Choice

You are evaluating investing in a cognitive training company.For this reason,you want to determine whether users who complete at least 75% of the recommended daily training for two months show improved levels of reading comprehension and problem solving skills.You select a random sample of new users and get test scores for each participant in the sample.The test score is a composite of reading comprehension and problem solving skills.Two months later,you randomly select 15 users who have completed 75% or more of the recommended training for the last two months and have them take a test similar to the initial test.You are interested in determining whether the average test score before training is different than the average test score after training for this sample.The after-training average is 92.8,which is 2.7 points higher than the before-training average.The sample standard deviations of the differences is 1.2.You can assume that the differences are normally distributed in the population.The degrees of freedom for this test are ______.

• A) 30
• B) 29
• C) 28
• D) 15
• E) 14

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Definitions:

Fodor

Refers to Jerry A. Fodor, an American cognitive scientist and philosopher known for his work on the modularity of mind.

Modular

Pertaining to the concept that cognitive processes are divided into separate, specialized units or modules, each responsible for different types of processing.

Domain-specific

Pertains to knowledge or skills that are relevant to a particular area of activity or field of study.

Wernicke's Aphasia

A condition resulting from damage to the Wernicke's area of the brain, characterized by difficulty in understanding language and producing meaningful sentences.