$\color{#10529c}\text{\small OBSERVATION}$

People seem significantly happier on sunny days than overcast ones.

$\color{#10529c}\text{\small HYPOTHESIS}$

Natural sunlight exposure leads to higher self-reported mood scores.

$\color{#10529c}\text{\small EXPERIMENT}$

Measure daily mood of Group A (sunlight) vs Group B (no sunlight).

$\color{#10529c}\text{\small ANALYSIS}$

Compare average daily mood scores between Group A and Group B.

$\color{#10529c}\text{\small CONCLUSION}$

Determine if the mood difference supports the initial hypothesis.