Fifty Students Are Enrolled in an Economics Class

question 13

Essay

Fifty students are enrolled in an Economics class. After the first examination, a random sample of 5 papers was selected. The grades were 60, 75, 80, 70, and 90.
a.Calculate the estimate of the standard error of the mean.
b.What assumption must be made before we can determine an interval for the mean grade of all the students in the class? Explain why.
c.Assume the assumption of Part b is met. Provide a 90% confidence interval for the mean grade of all the students in the class.
d.If there were 200 students in the class, what would be the 90% confidence interval for the mean grade of all the students in the class?

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Definitions:

Abstract Reasoning

The ability to analyze information, detect patterns and relationships, and solve problems on a complex, abstract level.

General Knowledge

Refers to information that individuals accumulate over time about a wide range of subjects through education and experience.

Psychological Tests

Standardized measures or assessments used to evaluate mental health, personality, abilities, or specific psychological constructs.

DNA

Deoxyribonucleic acid, a molecule that contains the instructions an organism needs to develop, live, and reproduce, encoded within the cells.