A Tutor Promises to Improve GMAT Scores of Students by More

question 34

Multiple Choice

A tutor promises to improve GMAT scores of students by more than 50 points after three lessons. To see if this is true, the tutor takes a sample of 49 students' test scores after and before they received tutoring. The mean difference was 53 points better after tutoring, with a standard deviation of the difference equal to 12 points. Let µ_D denote the mean of the difference: score after tutoring minus score before tutoring. Which of the following is the correct value of the test statistic?

• A) z = 1.7143
• B) z = 1.7500
• C) t₄₈ = 1.7143
• D) t₄₈ = 1.7500

Grasp the mechanisms of eye movements and their relevance to visual tracking.

Distinguish between static and dynamic equilibrium and identify their receptors.

Understand the importance and characteristics of descriptive and informational headings in document design.

Learn strategies for sentence lengthening and structuring for clarity and readability.

---

Definitions:

Disabilities

Conditions that limit a person's physical, mental, or sensory abilities, impacting their day-to-day activities and participation in society.

Dyslexia

A learning disorder characterized by difficulty reading due to problems identifying speech sounds and learning how they relate to letters and words.

Origins

The point or moment at which something begins or arises, often referring to the historical, geographical, or genealogical source of something.

Piaget's Theory

A theory of cognitive development that describes how children's understanding of the world changes as they grow through four stages of development.