Which of the following statements is both observable and measurable?

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The statement "Fred took three bites of his sandwich" is both observable and measurable because it describes a specific behavior that can be directly seen and counted. Observable behaviors are those that can be interacted with or witnessed, allowing practitioners to objectively assess them. In this case, the act of taking bites from a sandwich can be observed by someone present during the meal.

Moreover, this behavior is measurable; it quantifies the action with a specific number of bites. Measurement is an essential aspect of behavior analysis as it allows for tracking progress and evaluating the effectiveness of interventions.

In contrast, the other statements involve internal states or beliefs that are subjective and cannot be directly observed or quantified. For example, feeling happy, thinking it’s too hot, and believing it will rain tomorrow are all mental processes or emotions that cannot be measured or verified in the same objective manner as a physical action. This makes "Fred took three bites of his sandwich" the only statement that fulfills both criteria of being observable and measurable.

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