You Are Evaluating Investing in a Cognitive Training Company

question 66

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 observed t value for this test is ______.

• A)7.26
• B)8.71
• C)9.55
• D)9.81
• E)33.75

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Definitions:

Borderline Personality Disorder

A mental disorder featuring changeable emotional responses, behavioral patterns, and connections with others.

Dialectical Behavior Therapy

A comprehensive cognitive-behavioral treatment that aims to help people with complex psychological disorders to manage their emotions and reduce conflict in relationships by combining principles of mindfulness, emotion regulation, distress tolerance, and interpersonal effectiveness.

Posttraumatic Stress Disorder

A psychological disorder caused by exposure to a horrifying incident, leading to persistent nightmares, distressing recollections, and intense stress.

Family Systems Approaches

A therapeutic approach focusing on understanding and treating individuals within the context of their family dynamics, emphasizing interconnections and the influence of family relationships on individual behaviors.