Exhibit 10

question 48

Multiple Choice

Exhibit 10.9.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 denote the mean of the difference: score after tutoring minus score before tutoring. Refer to Exhibit 10.9.Assuming α = 0.05,which of the following is the appropriate critical value?

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Definitions:

Classified As Poor

A designation for individuals or households whose income falls below the poverty line, making it difficult to meet basic life needs.

Money Income

The total amount of money earned or received by a person or household before taxes and deductions, from all sources.

In-Kind Transfer

A form of payment made in goods, services, or other non-monetary form instead of cash.

Food Stamps

A government-funded program in the United States that provides low-income individuals and families with funds to purchase food to ensure nutritional standards are met.