The Mean Grade of the 30 Students in Section 1

question 111

Multiple Choice

The mean grade of the 30 students in Section 1 is 80. The mean grade of the 40 students in Section 2 is 85. The mean grade of the 30 students in Section 3 is 80. What is the mean grade of all students from the three sections combined?

• A) 80.00
• B) 81.67
• C) 82.00
• D) 85.00

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Definitions:

Experimental Method

A research methodology that involves manipulating one variable to determine if changes in one variable cause changes in another variable.

Scientific Evidence

Information that has been systematically collected and analyzed according to scientific methods to establish facts or principles.

Meta-Analysis

A statistical technique that combines the results of multiple scientific studies to identify patterns, increase power, or resolve uncertainty.

Replication

The process of duplicating or reproducing scientific research to verify its findings.