You Are Evaluating Investing in a Cognitive Training Company

question 42

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 from the original sample who have completed 75% or more of the recommended training in 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 deviation 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

---

Definitions:

Medical Group

An organized team of healthcare professionals, such as doctors and nurses, who provide a wide range of medical services to patients.

Management Role

Involves responsibility for strategizing, leading, and overseeing the operational and strategic aspects of an organization to achieve its objectives.

Practice Manager

A professional responsible for overseeing the business operations of a medical, dental, or healthcare practice, ensuring efficiency and quality care.