The following frequency distribution represents the number of hours studied per week by a sample of 50 students. 
(See the Excel Data File.) The mean number of hours studied is ________.
Definitions:
APA Code
The ethical guidelines set by the American Psychological Association for psychologists.
Human Welfare
The general health, happiness, and safety of a person or population, often used as a measure of the effectiveness of social policies.
Case Studies
A research method involving an up-close, in-depth, and detailed examination of a particular case or cases, often within a real-world context.
Researcher Bias
The tendency for researchers to influence the outcome of a study due to their personal beliefs, expectations, or preferences.
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