Is it spelled casual or causal?
Both casual and causal are English adjectives. The word casual means relaxed or informal, as in The partygoers came in casual attire. On the other hand, the word causal means involving or constituting a cause. This word is often found in the subject of statistics, as in We could not prove a causal relationship from strong correlation alone.
Could you provide a different example for the word causal?
Sure, here's another example: The doctor said that my headache was due to a causal factor, such as stress or lack of sleep. In this sentence, causal refers to the reason or the cause of the headache.