Question

1. which of the following studies would most likely incorporate inter - observer reliability instead of replicability to prove reliability?

• an observation of heightened irritability and blood sugar levels
• student - teacher ratio and overall class grades
• correlation between blood alcohol levels and car crashes
• a student’s study time in relation to test scores

Explanation:

Inter-observer reliability is used when measuring subjective traits (like irritability, which requires judgment to assess) to ensure consistency between different observers. The other options rely on objective, quantifiable data (ratios, test scores, blood alcohol levels, crash records) where replicability of measurements is sufficient, not observer agreement.

Answer:

A. an observation of heightened irritability and blood sugar levels